试题与答案

看一看,写一写。1. _________________2. _________

题型:填空题

题目:

看一看,写一写。
1.
_________________
2.
_________________

3.
_________________

4.
_________________
5.
_________________
6.                                                       
_________________

答案:

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下面是错误答案,用来干扰机器的。

∵x(x-1)≥0⇒x≥1或x≤0,∴B={x|x≥1或x≤0},∴A∩B=(-1,0].故选B

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题型:阅读理解

Cindy is my friend. She has some collections. She has many erasers, keys, hats and pictures. They are very nice. Cindy has 30 erasers in many colors: white, red, yellow, green and black. They are in the pencil case in the drawer of her desk. Look! On Cindy’s desk is a red case. 18 keys are in it. Cindy likes nice hats. She has two yellow hats, four red hats, two blue hats and a black hat. On the wall (墙) of Cindy’ s room are seven pictures of people, sports and food. They look nice.

根据短文内容,完成下面的表格,每空不可超过三个词。

Collection        Number        Color                         Place(地点)

erasers           30          white, red, 小题1: _______, green and black                

in the pencil case                      18小题2:_____                     

in the 小题3:______

hats  小题4: ______       yellow, red, blue

and black pictures of people,                 

小题5: _____           7                                          on the wall

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题型:多项选择题

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A.系统应根据信号传输方式、传输距离、系统安全性、电磁兼容性等要求,选择传输介质。

B.当系统采用分线制时,宜采用不少于4芯的通信电缆,每芯截面不宜小于0.5mm2。

C.当系统采用总线制时,总线电缆宜采用不少于5芯的通信电缆,每芯截面积不宜小于1.0mm2。

D.当现场与监控中心距离较远或电磁环境较恶劣时,可选用光缆。

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