置于室外的报警信号线输入、输出端口宜设置信号线路()
A.总线隔离器
B.浪涌保护器
C.空气开关
D.热继电器
参考答案:B
根据汉语提示,完成下列句子。
1. A good way to learn languages is___(尽可能 多地背).
2. They've____(使家乡富裕起来了).
3. No matter how I tried to read it, the sentence___ (意思还是不清楚).
4. ___(在路的尽头),there is a small shop.
5.____(他迟到的原因)was that his car broke down half way.
6. The land shouldn't____(被转让给汤姆).
7. ___(路分叉)where the tall building stands.
8. We___(铺床)in the spare room for our guest.
9. If we hadn't____(筋疲力尽),we would have won.
10. It is not good to have____(让孩子整天得在家 里).
保险公司的经营业务内容主要包括()、()、()、()和()。