城市消防远程监控系统由用户信息传输装置、报警传输网络、监控中

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问题单项选择题

城市消防远程监控系统由用户信息传输装置、报警传输网络、监控中心和（）等部分组成。

A.用户服务系统

B.火警信息终端

C.报警受理系统

D.远程查岗系统

答案

参考答案：B

填空题

用括号内单词的适当形式填空

1. This is my ______ (old)sister. She's one year ______ (old)than me.

2. If you want to be healthier and ______ (thin), you should eat less meat and take _____ (much)

exercise.

3. They were very happy throughout their _______ (marry)life.

4. That boy is the second _______ (tall)boy in our school.

5. Our town had ______ (little)snow this year than last year.

单项选择题

励磁涌流的特点不包括（）。

A、波形对称

B、包含有大量非周期分量

C、包含大量高次谐波分量

D、波形之间出现间断