当前位置:凯发k8一触即发首页 » 好大学答案 » 正文

847 人参与  2023-09-22 11:36:07  分类 :好大学答案

对于连续时间信号xa(t) = cos(6πt)u(t),按照fs = 12hz的频率进行采样,得到的离散时间序列(从n = 0开始)为________。

已知连续时间信号xa(t) = 4sin(20πt) - 5cos(40πt) 3sin(120πt) 2cos(176πt),若要对该信号进行采样,则在以下给出的频率中,满足奈奎斯特定理要求的最小采样频率是()。

在下面的离散序列中,哪个不是周期序列________。

假设某个系统可以由如下的框图表示,则其输入输出关系为________。

对于一个采样频率为fs = 1khz的数模转换系统,要想无失真地恢复出采样前的连续时间信号,则重构滤波器的频率响应hr(jω)为_______

对于一个采样频率为fs = 1khz的数模转换系统,要想无失真地恢复出采样前的连续时间信号,则重构滤波器的单位冲激响应hr(t)为_______。

浮点数144.0的8位二进制定点表示为_________,基于ieee 32位标准的二进制浮点表示为_________。

在adc转换时,输入信号幅度为1的正弦信号,adc工作在满量程状态,则当量化字长b = 8bits时(1个符号位7个数据位),量化过程的信噪比约为_________。

通信过程中,要用数字的方法对一个模拟信号进行处理,处理完成后再变回模拟信号,请简要描述该过程,注意说明信号处理过程中哪些是模拟信号,哪些是数字信号。

至少举2例说明日常生活中所遇到的数字信号处理的应用。

为什么要进行信号的变换域分析?

ctft的时频关系是什么?

当在时域对连续信号进行离散化(采样)时,其频谱会以什么样的模拟角频率进行周期化?当对这个频率进行怎样处理时,采样后的频谱就等价于dtft?

已知离散时间系统的输入输出关系为,分析它的线性性,时不变性,因果性和稳定性。

本书中只讨论线性时不变因果稳定系统,所以在现实中,所有的系统都是线性时不变的。

已知系统y[n]=2x[n] x[n-2]-3y[n-2]-y[n-1],则可知该系统是

任何离散时间系统都可以用冲激响应h[n]来表示其时域特征,即任何输入x[n]作用在该系统上产生的输出y[n]都等于输入x[n]与冲激响应h[n]的卷积。

下列关于z变换的说法,哪个不正确?

接续本课最后一个例子,已知一个因果lti离散时间系统的传递函数为 以下说法错误的是

下列关于滑动平均滤波器和中值滤波器的说法,错误的是

下列关于滤波器说确的是

尺寸线和尺寸界线( )绘制。

图样上的尺寸单位,除标高及总平面图以外,其余必须以( )为单位。

直径数字前应加符号( )

圆弧连接的主要问题是( )

实线包括哪几种?

尺寸的组成包括尺寸界线、尺寸线和尺寸数字。

图上的任何图线都可以作为尺寸线。

图上的尺寸应以尺寸数字为准,不得从图上直接量取。

草图是以目测估计图形与实物的比例,按一定画法要求徒手绘制的图。

在土木工程制图中,除了遵守建筑工程制图标准和某些行业标准外,还必须遵守的标准为:( )

由职能部门制定、颁布的制图标准,是级的标准,简称国标。国标的代号为:( )

图纸上的各种文字如汉字、字母、数字等,必须按规定字号书写,字体的号数为:( )

在字体的号数系列中,字体的号数值是其前一个号数值的:( )

位于图纸左侧内、外边框之间的长条是图纸的装订边,其大小为:( )

线型练习:题中尺寸单位为毫米。 要求: 尺规绘图 线型,字体,标注等要符合规范要求 比例:1:1 使用3号图纸(420mm*297mm)*1

详图索引符号中的圆圈直径是( )

定位轴线一般用( )表示

不能用于定位轴线编号的拉丁字母是( )

相对标高的零点正确的注写方式为( )

定位轴线1/3表示( )

关于建筑平面图的图示内容,以下那种说法是错误的 ( )

建筑平面图不包括( )

总平面图中,高层建筑的层数如何表示。( )

建筑施工图中除了标高用到了m做单位还有 ( ) 用到了m作单位。

在建筑施工图的平面图中,m一般代表的是( )

在总平面图中新建房屋用( )绘制。

房屋建筑制图标准规定,粗实线一般用于主要可见轮廓线。

室外散水应在底层平面图中划出。

建筑剖面图剖切符号一般应标注在标准层平面图上。

建筑立面图中表示散水构造做法。

建筑剖面图一般不需要标注楼板与梁的断面高度等内容。

学习绘制一层平面图。《建筑制图》教材163页。或见作业附件。

预应力钢筋混凝土的代号,应在代号前加( )

钢筋混凝土结构中承受拉、压应力的钢筋称为( )

一般梁中保护层厚度为( )

一级钢筋的牌号为( )

φ8@250中的@代表的是( )

配筋图中钢筋的断面用( )表示

画钢筋混凝土配筋图时,是否要画出混凝土材料图例( )

代号kz指的是( )

梁编号是( )

结构施工图中的图样使用正投影法绘制的。

钢筋的种类代号“φ ”表示的钢筋种类是hrb335钢筋。

梁中有分布钢筋。

柱平法施工图注写方式有截面注写和列表注写。

平面注写包括集中标注和部分标注。

l9(7b)表示第9号非框架梁,7跨,两端有悬挑。

抄绘钢筋混凝土t形梁的配筋图,补画3-3断面图。绘图比例为1:20

递交定稿方案成果(成果要求同快速设计任务书); 完成互评;

1、直接上传展板、文本;如果有长期有效的视频二维码,也可以直接上传; 2、以压缩包的形式将“展板、文本和视频”上传为“附件”;请预先通过格式工厂,控制视频的大小;确保整个压缩文件不大于50m;

下列哪一项不是“第一反应者”必须具备的条件(单选题)。

下列哪种病情最危急,需要优先处理(单选题)。

当患者心脏呼吸骤停,现场应该采取的急救措施为( )。

以下哪项不是现场救护的目标( )。

“第一反应者”是第一个目击患者,拨打急救电话等候医务人员赶到现场的人。

现场救护的流程是什么?

以下哪些疾病产生的胸痛为危重性?(多项选择题)

下列对胸痛患者的现场急救措施哪些是错误的?(单项选择题)

王伯,60岁,在和朋友们打乒乓球时突感胸口正中压迫性疼痛,感觉喘不过来气,他有高血脂症和糖尿病病史,请问应首先考虑如下哪项疾病?(单项选择题)

李先生,40岁,平时身体健康,这次从乘坐飞机回到北京,下飞机后,感觉胸口不适,胸闷,憋气,伴随胸痛,最有可能发生了什么?(单项选择题)

晨练时,小李兄弟俩发现每天在公园舞剑的张伯伯坐在地上,手捂着胸口,满头大汗,表情痛苦,请问哪些处理是不恰当的?(单项选择题)

在某城市某路公交车上,你和你的伙伴们共4人正在开心的聊天,前面老弱病残座位上的一位老人突然发出痛苦的,手捂住胸口,弱弱的喊着“痛、好痛”,你们作为学习过急救常识的第一反应者,目前最佳的处理是什么?

中毒的病人双侧瞳孔都变大。

闭锁综合症是昏迷的一种特殊形式。

以下哪项不是gcs的评估指标( )。

发现疑似“昏迷”病人第一步该怎么做( )。

将昏迷病人摆放成侧卧主要是防止呕吐造成窒息。

腹部有注射痕迹的昏迷患者最可能是吸毒患者。

如何摆放昏迷患者的侧卧。

急性腹痛的现场处理原则不包括( )。

急性腹痛的危重情况不包括( )。

急性阑尾炎的最常见疼痛部位是( )。

急性胰腺炎的常见诱因是( )。

急性腹痛现场处理有哪些要点。

某同学手掌被划伤,在手掌划伤处包扎后可见渗血,采用下列哪种措施紧急处理最合适( )。

下列哪项不是骨折急救的目的( )。

某同学踢球时不慎将小腿划伤,伤口约10cm,用下列哪种包扎方法最合适( )。

一高处坠落伤患者,四肢感觉尚可,运动减弱,宜采用哪种搬运方式( )。

使用止血带时,应每隔1小时,松解3-5分钟。

发生腹部损伤伴腹腔脏器脱出时,可以将脱出的脏器还纳至腹腔。

使用止血带止血的处理流程是?

重度气道异物梗阻可能会有哪些表现(多选题)。

为避免损伤周围的器官和组织,腹部冲击时尽量轻点(判断题)。

腹式冲击法的位置在哪里。

气道异物梗阻最主要的危害是什么。

婴儿发生重度气道异物梗阻时,可使用背部拍击法和胸部冲击法急救。

孕妇发生重度气道异物梗阻时,也可以正常使用腹部冲击法。

如果家里有小孩子,请举出至少5种可以减少或避免小孩子发生气道异物梗阻的做法,并说明理由?

since we have learned so many phonetic skills, shall we go through a test to see whether we have mastered all of them or not? now please finish 1-5 questions, listen to me and choose the word that you hear from what i say. 音频1

listen to me and choose the word that you hear from what i say.

listen to me and choose the word that you hear from what i say.

listen to me and choose the word that you hear from what i say.

listen to me and choose the word that you hear from what i say.

listen to me and choose the word that you hear from what i say. 音频2

listen to me and choose the word that you hear from what i say.

listen to me and choose the word that you hear from what i say.

listen to me and choose the word that you hear from what i say. which of the following words is not mentioned?

listen to me and choose the word that you hear from what i say. which of the following words is not mentioned?

listen to the following sentences and choose the sentence with right liaisons. 音频11-15

now listen to the following sentences and try to recognize loss of plosion and assimilation in each sentence. 音频16-20

finally read the following tongue twisters and enjoy. 音频20-25

please dictate the script of the news in "assignment of w1: dictation"

now let’s watch its commercial and get more information. choose the best answer to each of the questions you hear. 音频5 1. what does biztrumpet provide?

which is the best word to describe tools provided by biztrumpet?

you are going to watch an ad. listen carefully and fill in the missing information. 注:用一个空格分开每个答案 音频4 an ad if there is one thing you do today, get your (1)__business online.

50 million businesses don’t have a website, that’s (2)__ of all us businesses.

for more businesses we get online, the more (3)__ we create. what if every business can hire just one person, that’s a lot in new jobs.

i went from one employee to (4) __. the web took us from a local shop to a global business.

over (5) ___ of our students come from the web.

you can (6) __ in a big way. in a big way. you might own a business, or a friend or a family member who does. there’s one thing you do today.

tell your mother, your brother, sister, your (7)__, your uncle, a friend. if there is one thing you do today, just one thing, get a business online.

which of the following is not true about traditional stores?

how many temporary workers are hired by ups during the holiday season to deliver gifts?

listen to the news report once again and decide whether the following statements are true (t),false(f),or not given (ng). 音频7 1. lynne shaner purchases everything online.

online shopping can provide a better selection according to lynne shaner.

cornell university marketing professor ed mclaughlin thinks anything that cannot move online, will.

ed mclaughlin says traditional stores can provide better services.

bill martin thinks we can always have the feeling of “boy, this is exactly what i want” when we shop online.

section b: directions: listen to a talk about taking notes and choose the best answer. 音频9 which of the following presents the best way to take notes as far as the part about business and marketing mentioned by the professor?

what trouble does mary have?

what’s the professor’s attitude towards writing things down?

how to take notes according to the professor?

if we miss something, how can we deal with it according to the professor?

section a directions: decide whether the following statements are true or false. to help us understand what we are listening to, it is better to write every word.

it is not necessary to leave space when taking notes.

we can even use chinese to take notes when listening to an english lecture.

we can also create our own system of symbols and abbreviations.

structure words are usually the key information we need to write down.

please dictate the script of the news in "assignment of w2: dictation"

now let’s watch a clip from this film an inconvenient truth, and try to get a global understanding about global warming. after watching the video, choose the best answer to each of the following questions. 视频5 1. what is the main idea of the video clip?

2. what causes the earth to be warmer according to the video clip?

you are going to hear a passage about some studies of global warming. listen carefully and fill in the missing information. 注意:如果一题多空,请用空格分隔开每个答案。 音频4 during the last thirty years, the (1) ________ of the world has increased sharply, so it is the same with the (2) ________.

global warming is an (3) ________ serious problem facing the world today.

as we all know that there is atmosphere around the earth, which is mainly (4) ________ of nitrogen and carbon dioxide.

more and more carbon dioxide from burning the coal and oil is (5) ________ into the air every year. the carbon dioxide can absorb the heat from the earth. the more carbon dioxide in the air, the more heat it will absorb, and the warmer the earth will be.

since the (6) ________ revolution, coal and fossil oil have been wildly used.

however, this kind of energy will (7) ________ plenty of greenhouse gases, such as carbon dioxide, methane, (8) ________ vapor and so on.

that’s maybe one of the reasons (9) ________ the earth to be warmer.

ruining the forest is also accelerating the (10) ________ of the global warming.

please fill in the blanks 1 to 8. 注意: 如果一题多空,请用空格分隔开答案。 topic: the cause of (1) ________

supporting details: the most (2) ________ part of the earth’s ecological system is the atmosphere, because it’s so (3) ________.

the sun’s radiation comes in the form of (4) ________waves and that heats up the earth.

and then some of the radiation is (5) ________back into space.

and some of the outgoing infrared radiation is (6) ________by atmosphere.

this layer of atmosphere is being (7) ________by all of the global warming pollution.

so more of the outgoing infrared remains in the atmosphere. as a result the atmosphere heats up (8) ________.

watch the lecture for the first time and choose the right answer to the each question. 视频8 1. what is plastic made from?

2. what can we learn from the passage?

2. the birthplace of plastic is the oil refinery.

3. after a series of manufactory processes, oil and gas molecules become plastic products.

4. it takes a long time for plastic bottles to be manufactured, consumed and discarded.

section b directions: in this part, you will read a passage about the similarity and differences between the twin brothers george and paul. fill in the blanks with the correct joining words that show comparison and contrast. a. in contrast to b. although c. but d. however e. both george and paul are twin brothers. they are twenty years old and study in the same college. (1) ________ george and paul have blue eyes and brown hair, and they are tall and slim. many people say they are identical at the first sight. (2) ________ if you are their close friends, you will notice many differences between them. george likes to read science fiction, (3) _________ paul likes to read poetry. (4) _________ george is an engineering major, paul still hasn't found a major. (5) __________ george’s outgoing personality, paul is much shier and quieter. 注意:请按题目顺序填入大写字母,字母之间空一格。

please dictate the script of the news in "assignment of w3: dictation"

choose the best answer to each of the questions you hear. 音频7 1. what is the speaker mainly talking about?

2. why did the speaker show the video about a woman speaking koro to her baby?

3. which of the following is true, according to the text?

the critical period hypothesis states that the first few years of life is the(2)_______time in which an inidual can acquire a first language if presented with adequate stimuli.

the nature of such a critical period, however, has been one of the most fiercely debated issues in psycholinguistics and cognitive science in general for decades. some writers have suggested a(5) "_________" or "optimal" period rather than a critical one; others dispute the causes (physical maturation, cognitive factors).

the duration of the period also(6)____________ greatly in different accounts.

in second-language acquisition, the strongest evidence for the critical period hypothesis is in the study of (7)_________, where most older learners do not reach a native-like level.

however, under certain conditions, native-like accent has been observed, suggesting that accent is affected by multiple factors, such as identity and (8)____________, rather than a critical period biological constraint.

listen to the text for the first time, focus on the global idea of the passage and then choose the right answers to the questions you hear. 音频9 1. what is not included in a good eap course?

2. what problem is not mentioned in the text to students studying eap?

now listen to the passage again and decide whether the following statements are true(t), false(f) or not given(ng). 音频9 1. during your university course, you’ll lead a double life.

2. eap is actually studying english for academic purposes.

3. if you speak academic english, you’ll know a special vocabulary associated with your subject, and you’ll be used to writing or speaking in a particular way.

4. a good eap course can enable you to make friends easily.

5. students often pay more attention to vehicles than to what they contain.

please dictate the script of the news in "assignment of w4: dictation"

choose the best answer to each of the following questions. 音频6 1.which of the following is not true according to the speech?

how did the speaker come to the conclusion that timing is the most important for start-up business?

you are going to hear a passage about two students in britain starting up business. listen carefully and fill in the missing information. 音频5 bird feathers have long been used in clothing and in bedding. manufacturers often use feathers because of their light 1________ and the warmth they provide in a cold room or climate.

now, two students in britain are studying how to use them in other ways, like keeping homes warm, for example. a student 2_________ has success.

chicken is a popular food in many countries, and the number of poultry killed for their meat is rising. britain alone processes more than 3 ________ white-feathered chickens every year, creating tons of leftover feathers.

two students from imperial college london want to turn these feathers into something 4 __________.

the two had an idea to create useful materials from waste. they developed a biodegradable 6_________ that could replace man-made insulation. biodegradable materials are capable of being slowly broken down through natural processes.

builders usually add insulation to homes and offices. the insulation can reduce the 7________ demands of heating and cooling systems. dieckman and robinson won several awards for their prototype insulation, including the mayor of london's low carbon entrepreneur challenge.

the $23,000 they won in the 8___________ helped them start their company, aeropowder.

listen to the news report for the first time and choose the right answers to questions you hear. 音频8 what is the percentage of chinese college graduates choosing to start their own business?

which of the following is not the reason why college entrepreneurs are so rare in china?

experts say china is the third best place for entrepreneurs.

the government tries to create a better environment for college students to start their own business.

most parents don’t support their children to start their own business.

section a directions: choose the best answer to the following questions. 1. which signal phrase can be used to introduce the transition to the next part? a. what i'm going to look at b. as a consequence c. we'll move on to d. as a result of e. to review

which signal phrase can be used to express cause? a. what i'm going to look at b. as a consequence c. we'll move on to d. as a result of e. to review

which signal phrase can be used to indicate the conclusion part? a. what i'm going to look at b. as a consequence c. we'll move on to d. as a result of e. to review

which signal phrase can be used to introduce the topic? a. what i'm going to look at b. as a consequence c. we'll move on to d. as a result of e. to review

which signal words can be used to express effect? a. what i'm going to look at b. as a consequence c. we'll move on to d. as a result of e. to review

please dictate the script of the news in "assignment of w5: dictation"

listen to the text for the first time and choose the best answer to each of the questions you hear. 音频5(请将音频调至: 09:14---13:48 ) 1.what is the speaker mainly talking about?

which of the following can best explain the meaning of collaborative consumption?

listen carefully and fill in the missing information. culture notes rachel botan is the co-author, with roo rogers, of the book what’s mine is yours: the rise of collaborative consumption, and she writes, consults and speaks on the(1) of collaboration and (2) through network technologies, and on how it will (3) business, consumeri and the way we live. her new work (4) on trust and reputation (5) . (1)

(2)

(3)

(4)

(5)

she is the (6) of the collaborative lab, an innovation incubator(孵化器) that works with startups, big businesses and local governments to (7) innovative solutions based on the ideas of collaborative consumption. she has consulted to fortune 500 companies and leading (8) organizations around the world on (9) and innovation (10) , and was a former director at the william j. clinton foundation. (6)

(7)

(8)

(9)

(10)

how can you protect your money when making investment?

a very important thing for investment is to ensure the way to balance.

the asset allocation should be the purpose of making your investment.

the more risk you’d like to take, the more profit you’ll make.

please dictate the script of the news in "assignment of w6: dictation"

choose the best answer to each of the following questions. 音频4 1. what is the text mainly about?

which of the following is not mentioned in the lecture?

you are going to hear a passage about high-context culture and low-context culture. listen carefully and fill in the missing information. 音频3(请将音频调至18秒开始,播放至结束) high-context culture refers to societies or groups where people have close connections over a long period of time. many 1________ of cultural behavior are not made explicit(明确的) because most members know what to do and what to think from years of 2_________ with each other. high-context culture relies heavily on 3_________, often nonverbal 4________ to maintain social 5_________. it can be found in asia, most of latin america, africa and middle east countries. low-context culture refers to societies where people tend to have many connections but of shorter 6________ or for some specific reason. in these societies, cultural behavior and beliefs may need to be 7________ explicitly so that those coming into the cultural environment know how to behave. low-context culture uses language primarily to express 8________, feelings and ideas as directly as possible. the lowest context cultures are germany, britain, the united states, switzerland and scandinavian countries. 1.

2.

3.

4.

5.

6.

7.

8.

listen to the text for the first time and choose the right answers to questions you hear. 音频6 1. what is the text mainly about?

which of the following countries tend to “me” culture?

now let’s listen to the text again and decide whether the following statements are true, false or not given.(用t,f,ng表示) 1.all americans put strong emphasis on iniduality.

the two basic types of culture mentioned in the text are inidualistic culture and collectivistic culture.

china is the most “we” country on the planet.

people from different cultures are unable to dance together.

cheating is acceptable in middle east countries.

please dictate the script of the news in "assignment of w7: dictation"

choose the best answer to each of the following questions. 音频1 1.what is the passage mainly about?

which of the following only belongs to chinese high-speed trains?

you are going to hear a passage about high-speed rail (hsr) in china. listen carefully and fill in the missing information. 补录3 high-speed rail (hsr) in china refers to any railway in china with 1. train service at the speed of 2. km/h or higher as internationally recognized. by this definition, china has the world's 3. hsr network with over 16,000 km of track in service as of december 2014which is more than the rest of the world's high-speed rail tracks 4. , and a length of 16,775.5 km is 5. or in planning. since high-speed rail service in china was 6. on april 18, 2007, daily ridership has grown from 237,000 in 2007 to 2.49 million in 2014, making the chinese hsr network the most 7. used in the world. cumulative ridership had reached 2.9 billion by october 2014. 1.

2.

3.

4.

5.

6.

7.

listen to the passage for the first time, focus on the global idea of the passage and then choose the right answers to the questions you hear. 音频3 1.what is america’s challenge in the 21st century according to the passage?

how many forms of transportation in new york are mentioned in the passage?

now let’s listen to the passage again and decide whether the following statements are true, false or not given. 音频3 there are 7500 airports in america.

chicago has a powerful but aging transportation network.

on a weekday morning, there can be about 3.2 million people in manhattan.

grand central terminal is the busiest commuter center in america.

now in exercise 1, you will listen to two british students talking about their favorite means of transportation in shanghai and try to identify the expressions they used to support their opinions and connect their ideas to each other. exercise 1 音频0178 how did becka respond to anna’s choosing shared bikes as her favorite form of transportation?

how many reason(s) did becka give to support her opinion that metro is the best form of transportation in shanghai?

choose the best answer to each of the following questions. 音频3 1. what is the speaker mainly talking about?

why did the speaker show us the picture about a swimmer, a rowboat, a sailboat, and a tugboat?

which of the following is true, according to the text?

listen carefully and fill in the missing information. 音频2 drug development is the process of bringing a new pharmaceutical drug to the market once a lead 1_____ has been identified through the process of drug discovery. it includes pre-clinical research on 2_____ and animals, clinical trials on humans, and may include the step of obtaining regulatory approval to market the drug. the full cost of bringing a new drug to market – from discovery through 3_____ trials to approval – is complex and controversial; typically it is hundreds of millions or billions of u.s. dollars. candidates for a new drug to treat a disease might theoretically include from 5,000 to 10,000 chemical compounds. on average about 4_____ of these will show sufficient promise for further evaluation using laboratory tests, mice and other test animals. typically, about 5_____ of these will qualify for tests on humans. 1.

2.

3.

4.

5.

which of the following is not true according to the conversation?

2. being a man is a pre-existent condition. ( )

3. japan doesn’t have a nationalized health insurance program. ( )

4. we should ensure that the insurance companies aren't too powerful. ( )

5. private healthcare is more popular in the states. ( )

please dictate the script of the news in "assignment of w11: dictation"

设计算机字长 8位,设x = -5, [x]补 为 ( ) (单选)

系列关于补码机器数的描述中错误的是( ) ( 单选)

下列关于移吗的描述中,错误的是( )(单选)

ieee754浮点数x的二进制存储格式为(41360000)h,其对应的十进制值为( ) (单选)

某计算机字长8位,机器数 11111111 对应的十进制真值不可能是( ).(单选)

备案号: 凯发娱乐官网的版权所有 凯发k8一触即发 copyright © 2012-2023 凯发k8一触即发-凯发娱乐官网 all rights reserved. sitemap

网站地图