变化极为缓慢的频率极低的非周期性的或恒定不变的信号叫()信号。 A.交流 B.正弦

题型:单项选择题

问题:

变化极为缓慢的频率极低的非周期性的或恒定不变的信号叫()信号。

A.交流

B.正弦

C.直流

D.脉冲

考点:家电维修工试题家电维修工试题题库
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总平面设计是指总图运输设计和总平面布置,主要包括( )等内容。

A.厂址方案、占地面积和土地利用情况

B.总图运输、主要建筑物和构筑物及公用设施的配置

C.合理布置工艺流程

D.外部运输、水、电、气及其他外部协作条件

E.工程的平面立体设计和结构方案及工艺要求的因素

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黄州东湖路上,在传统的交通标志白线上每隔2米安装了一个凸起的纯玻璃元件,这种元件叫“夜精灵”.晚上只要汽车的灯光一照,司机就能看到附近地上的“夜精灵”亮起来(如图所示).下面几种元件的工作原理与夜精灵完全不同的是(  )

A.高速公路反光标志牌

B.十字路口的红绿交通标志灯

C.自行车的尾灯

D.环卫工人身上穿的反光马甲

题型:单项选择题

(),是指与现代通讯技术相联系,包括电报、电传、传真、电子数据交换和电子邮件等。

A.合同书

B.信件

C.信息

D.数据电文

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E

Dear Sir/Madam,

I read Alison Burnham’s review of When We were 12, and I do not agree with her. I thought the programme was wonderful — I found the old news pictures really interesting — they helped to bring to life the stories the people were telling.

The programme reminds me of many things from my own childhood. For example, one day when I was about five, I was going to school on the bus by myself (this was the late 1960s). My mother had given me exactly the right money for a return ticket. I held out my hand with the money in it — one big coin on top of one little coin. The bus conductor took the big top coin only and she gave me a ticket, but it was a pink one for a single journey. I needed a white one for a return journey, but I was too frightened to say anything. When school finished for the day, I couldn’t catch the bus home — I had to walk. As a grown-up, whenever I’ve been in a situation where I need to say something or take some action, this early memory of my bus ride comes back to me, and I’m able to take control of the situation.

I would like to say to the director, Bret Chrysler, carry on making this kind of programme. Too much TV these days is quiz shows and so-called “reality programmes”. I appreciate the human story that can make me laugh and cry.

Chris Daniels

72. What is Chris Daniels’ purpose of writing this letter?

A. To persuade Bret Chrysler to turn away from quiz shows.

B. To entertain other readers with old news pictures.

C. To express his appreciation of the programme.

D. To have his story told on the programme.

73. Chris Daniels tells the story about the bus ticket to _____.

A. describe how painful his early experience was

B. draw a direct response from Alison Burnham

C. show how the programme made him think

D. teach the readers of TV Weekly a lesson

74. According to the passage, Chris Daniels had to walk home because _____.

A. he hadn’t got a return ticket                 B. he had lost his bus ticket

C. he didn’t like big crowds                   D. he missed the bus home

75. What does Chris Daniels now think about his experience on the bus?

A. He should have told the conductor then.     B. He should have been well treated.

C. He regrets going to school alone.             D. He wishes it hadn’t happened.

题型:单项选择题

二级公路设计速度分哪些?

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