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
参考答案:B
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.
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