抱匝开关、热敏开关、抱匝线圈、盘车开关等控制电气开关需接地,有盘车开关的必须接入(),OH5000系列电梯的抱匝线圈线径必须大于2.5mm2。
参考答案:安全回路
1853年,太平天国在南京定都,改名天京,并在占领区苏南地区建()省和()省。
用括号内所给动词的适当形式填空。
1. Next Friday, Duan Linxi _____ (leave) Baoshan for Sishui.
2. I forgot _____ (tell) him. So he knew nothing about it.
3. I try _____ (get) good grades in this English exam.
4. My good friend always makes me _____ (laugh).
5. He finished _____ (read) before 10:00 yesterday.
6. It takes me half an hour _____ (exercise) every day.
7. Eating Dangshen and Huangqi herbs _____ (be) also good for this.