第2周 第3次 作业

y0(t)
1
t
0
2
4
(6) x(t) = dx0 (t) , h(t) = dh0 (t) 。
dt
dt
x(t) * h(t) = dx0 (t) * dh0 (t) = d 2 y0 (t)
dt dt
dt 2
x(t) ∗ h(t) = 0.5δ(t) − 0.5δ(t − 2)
2.10 求 y[n] = x1[n]* x2[n]* x3[n] 。 其 中 x1[n] = (0.5)n u[n] ， x2[n] = u[n + 3] 和
（2）利用（1）的结果，求系统的逆系统的单位样值（脉冲）响应。
（3）利用（2）的结果，结合卷积性质，求一信号 x[n]，使之满足
x[n]* h[n] = 2n (u[n] − u[n − 4])
解：（1） h[n] − Ah[n −1] = δ [n]，其中 h[n] = (1 )n u[n] ， 2
（通项： an = a1q n−1 ）
n
∑ 此题： a1 = 1, q = 2 ； x[n]* h[n] = 2nu[n]*u[n] = ( 2k )u[n] = (2n+1 −1)u[n] k =0
2.6 计算图 2-45（b）与（c）所示信号 x(n)与 h(n)的卷积和,注意：N＝4。 解：（b）利用脉冲信号δ(n)的卷积性质以及卷积的延时性质计算：
k =−∞
+ 3] =
u[n + 3] 0.5k
k =0
；
= 2(1 − 0.5n+4 )u[n + 3]
（2） x1[n]* x2[n]* x3[n] = 2(1 − 0.5n+4 )u[n + 3]* (δ [n] − δ [n −1]) ； = 2(1 − 0.5n+4 )u[n + 3] − 2(1 − 0.5n+3 )u[n + 2]

第3次作业一、单项选择题（本大题共20分，共 10 小题，每小题 2 分）1. 流水施工的施工段数属于（）A. 技术参数B. 时间参数C. 空间参数D. 工艺参数2. 施工现场单车道运输道路的宽度一般应不小于( )。

A. 3～3.5mB. 3.5～4mC. 4～4.5mD. 4.5～5m3. 单代号搭接网络计划中，工作之间逻辑关系表现为（）。

A. 相邻工作的时间间距B. 工作的总时差C. 工作的自由时差D. 工作的持续时间4. 在建设工程项目施工中处于中心地位，对建设工程项目施工负有全面管理责任的是（）。

A. 施工现场业主代表B. 项目总监理工程师C. 施工企业项目经理D. 施工现场技术负责人5. 在流水施工中,造成专业队窝工是由于出现( )A. M0=NB. M0＞NC. M0 ＜ND. M0≤N6. 某工程有3个施工过程进行施工，其流水节拍分别为2天、4天、6天，这三个施工过程组成成倍节拍流水，流水步距为（）A. 1天B. 2天C. 3天D. 4天7. 网络计划中，某项工作的进度偏差大于该工作的自由时差，小于总时差，则它将（）。

A. 对后续工作与工期产生影响B. 对后续工作与工期均不影响C. 对后续工作影响，不影响工期D. 对后续工作不影响，影响工期实际进度间断情况8. 施工总平面图设计需要布置的主要项目有:①内部运输道路;②仓库与材料堆场;③施工临时设施;④施工使用的加工场。

设计时,对上述内容布置的先后关系正确的是( )。

A. ①-②-③-④B. ②-①-④-③C. ④-②-③-①D. ②-④-①-③9. 网络计划中，紧前工作与紧后工作共同拥有的机动时间称为紧前工作的( )。

A. 总时差B. 自由时差C. 相干时差D. 线路时差10. 某项目组成甲、乙、丙、丁共4个专业队在5个段上进行无节奏流水施工,各队的流水节拍分别是:甲队为3、5、3、2、2周,乙队为2、3、1、4、5周,丙队为4、1、3、2、5周,丁队为5、3、4、2、1周,该项目总工期为( )周。

2023-2024第一学期七年级第2周限时作业（语文）姓名：_______ 班级：__________(满分100分，时间60分钟)一．积累与运用（54分）参见右图）“口”）1.（15分）请将你可以拼出的词语写在方格里。

（拼出1个词语可得4分，书写3分)参考词：竦峙娇媚酝酿衣裳娇嫩（学生如果答不出，就一字2分）【刷新语言】2.(11分）小新同学觉得这个汉字魔方很好玩，就在留言本上留言点赞:“这样的活动不落kē臼，我喜欢!”小新竟然用拼音代替自己不会写的字，这可不行。

请你告诉小新:kē字我们在第一单元学过了，我写给你看:①________。

它的本义是②，在成语“不落kē臼”里引申为③。

以后如果再遇到不会写的字，身边又没有字典可查，可以换一个意思相近的词来表达，你刚才也可以用“④”来表示点赞的。

⑴请你写出横线①处的字。

________（2分）窠⑵根据下面释义,为横线②、③两处分别选择恰当的义项。

( A)（ D ）(6分）A.筑在地洞里的鸟窝B.其他动物的巢穴C.写碑文或篆刻时划的界格D.老套子，陈旧的格调(3)为横线④处选择一个恰当的成语。

( B )（3分）A.横生枝节B.不落俗套不落kē臼：为不落俗套，有独创风格(多用于形容文章或艺术作品)。

3.(6+3+2分）傍晚时，小高抬头看见西边天空的晚霞，便在当天的日记中写下这样一句话:天边的云霞，色彩非常丰富，真好看。

请你用上比喻或拟人中至少一种修辞手法,把他这句话改得好一些，并简要说说你这样改动后有怎样的好处。

(其中3分为标点符号、错别字分，一处一分，3分封顶）你的改写：(修辞手法正确2分，表达精准2分，语言优美2分）好处（2分）：（生动形象1分，比较1分）_____________________________________________________________________________________________________________________________________ *4．(8分）学了第四课《古代诗歌四首》后，小高写作时喜欢引用诗歌了。

六年级第一学期第二大周月假作业Homework for Grade SixName(姓名)______________Class(班级)_________________同学们，每天记得抽些时间朗读英语哦，并做好以下记录！Words:cloud / cloudy sun / sunny rain / rainy wind / windy snow / snowy storm / stormy fog / foggy 30 degrees Sentences:---Today is … (day) What ’s the weather like? What ’s the temperature? --- It ’s … (weather) today. It ’s … (temperature)--- What was the weather like yesterday? What was the temperature? --- It was … (weather) yesterday. It was … (temperature) 一．Read and choose. (选出划线部分发音不同的选项)（）1. A. third B. month C. they （）2. A. weather B. read C. heavy （）3. A. don ’ｔ B. nose C. snow （）4. A. they B. father C. think （）5. A. cloudB. growC. now二．Look and write （看一看，写一写，每线一词，首字母已给）：1.2.3.4.5.6.1. Look, it ’s as _________ day today. The wind blows strongly. 2. --- What ’s the boy doing? --- He ’s m_________ a snowman. 3. --- What ’s the temperature?--- It ’s thirty d__________.4. --- Do you like the w__________ days? --- No, I don ’t.5. --- Are there any white c__________ in the sky?--- Yes.6. --- Can you see the building clearly? --- No, it’s af__________ day. 三．Read and choose. () 1. --- What colour is __________ sun? --- It ’s red.A. theB. aC. /Date(日期) Sign(签名)( ) 2. There are __________ days in three weeks.A. fourteenB. twenty-oneC. twenty-eight( ) 3. Look, the dragonflies（蜻蜓）fly very low. It will be a ________ day.A. sunnyB. windyC. rainy( ) 4. --- __________ is the weather? --- It’s fine.A. WhatB. HowC. Where( ) 5. Let’s buy a present for her. She_____________ happy.A. was .B. will beC. is( ) 6. It __________ snowy yesterday. The birds __________ very coldA. was…wasB. is…areC. was…were( ) 7. --- Is it one __________ today? --- Yes. It’s very cold.A. degreeB. degreesC. temperature( ) 8. It’s a __________ day. Let’s go for a picnic in the park.A. sunB. the sunC. sunny( ) 9. --- Pitter-patter, pitter-patter. What do you hear? --- The________.A. rain B wind C. rainy( ) 10. --- _________ is it today? --- It’s Friday.A. WhatB. What dayC. That day四．Look and write（朗读句子，按要求写出相应的同类词，每线词数不限）：sunny.1. --- What is the weather like today, Peter? --- It’s__________ __________ __________ __________2. --- Hey boy, no fishing here. --- OK.__________ __________ __________ __________Monda y.3. --- What day is it today? --- It’s__________ __________ __________ __________4. --- Where’s the book? --- It’s on the desk.__________ __________ __________ __________五. Look, think and write（根据如下图标，写出完整的单词形式完成短文）：1.3rd Jan. Mon. 1It’s the __________ of __________ (date). It’s __________ (week). How is the__________ (temperature).__________ (weather). It’sweather? It’svery cold. It’sWe can / can’t _________________________.2. .4th Oct. Wed. 15It’s the __________ of __________ (date). It’s __________ (week). How is the__________ (temperature).__________ (weather). It’svery cold. It’sweather? It’sWe can / can’t ___________________________.4.3rd Apr. Sun. 17It’s the __________ of __________ (date). It’s __________ (week). How is the__________ (weather). It’s__________ (temperature).very cold. It’sweather? It’sWe can / can’t __________________________.Tips for you：Mon.=Monday Tues.=Tuesday Wed.=WednesdayThur.=ThursdayFri.=Friday Sat.=Saturday Sun.=Sunday Jan. = JanuaryFeb.= FebruaryMar. =March Apr.=April May.=May June.= JuneJuly.=JulyAug.=August Sept.= September Oct.=October Nov.=NovemberDec.=December六．Read and number（读一读，填上适当的句子完成对话，每句限用一次）：A. Do you like sunny weather?B. Sometimes we play in the school.C. But what’s the low temperature?D. Can you play football today?E. The sun shines.F. What’s the weather like today?Jane and Jack are classmates. Now they are talking about the weather.Jane:Do you like sunny days, Jack?Jack:Yes. _______________ And I can go to play football with my friends.Jane: Where do you play it?Jack: Sometimes we play in the park. _____________________________Jane:______________________________a cloudy day. But I don’t know the temperature. Let me listen to theJack: It’sradio. …　Oh, the high temperature is 30 degrees.Jane:Oh, it’s very hot. __________________________Jack: It’s 24 degrees.Jane: ________________________________Jack:I’m afraid I can’t. It will be rainy this afternoon.七．Let’s read.A. A classThe children of Class Three, Grade Five are having an English class. Miss Li isMiss Li: Children, what’s the weather like today?Danny: The sun is shining today. There are some white clouds in the sky. The birds are singing happily.Miss Li: Do you like sunny days?Peter: Yes, but I like cloudy days best.Alice: My favourite weather is snowy days. I like making snowmen outside.Ben: I like foggy days.Read and judge（阅读短文，判断正误，用“T”或“F”表示）：( ) 1. The children are in Class Five, Grade Three.( ) 2. Miss Li an English teacher.( ) 3. The children are talking about the sun.( ) 4. It’s a sunny day today.( ) 5. Ben doesn’t like foggy days.B. The Weather ReportHere is the weather report for June, the fourteenth. We had a very hot and sunny day yesterday. T he high temperature i s thirty-two degrees, a nd the low temperature was twenty-nine degrees.wet. The high temperature is thirty degrees, and the low Today is cloudy. It’stemperature is twenty-six degrees.It will be windy tonight. A typhoon is coming from the East China Sea. We will have heavy rain and a strong wind tomorrow. The high temperature will be twenty-eight degrees.A. Read and number（阅读短文，将下列图片按顺序用1-4编号）：( ) ( ) ( ) ( )B. Read and judge（阅读短文，判断正误，用T或F表示）：( ) 1. It was a cloudy day yesterday.( ) 2. It is a cloudy today.( ) 3. The low temperature was 19℃ yesterday.( ) 4. It will be a windy day tomorrow.( ) 5. The strong wind comes from the South China Sea.Miss Li: Children, what’s the weather like today?Danny: The sun is shining today. There are some white clouds in the sky. The birds are singing happily.Miss Li: Do you like sunny days?Peter: Yes, but I like cloudy days best.Alice: My favourite weather is snowy days. I like making snowmen outside.Ben: I like foggy days.Read and judge（阅读短文，判断正误，用“T”或“F”表示）：( ) 1. The children are in Class Five, Grade Three.( ) 2. Miss Li an English teacher.( ) 3. The children are talking about the sun.( ) 4. It’s a sunny day today.( ) 5. Ben doesn’t like foggy days.B. The Weather ReportHere is the weather report for June, the fourteenth. We had a very hot and sunny day yesterday. T he high temperature i s thirty-two degrees, a nd the low temperature was twenty-nine degrees.wet. The high temperature is thirty degrees, and the low Today is cloudy. It’stemperature is twenty-six degrees.It will be windy tonight. A typhoon is coming from the East China Sea. We will have heavy rain and a strong wind tomorrow. The high temperature will be twenty-eight degrees.A. Read and number（阅读短文，将下列图片按顺序用1-4编号）：( ) ( ) ( ) ( )B. Read and judge（阅读短文，判断正误，用T或F表示）：( ) 1. It was a cloudy day yesterday.( ) 2. It is a cloudy today.( ) 3. The low temperature was 19℃ yesterday.( ) 4. It will be a windy day tomorrow.( ) 5. The strong wind comes from the South China Sea.。