保护接地
参考答案:
为了防止触电,把在正常情况下不带电而在故障情况下可能呈现危险的对地电压的金属部分,通过接地装置与大地可靠地连接起来,这种措施称为保护接地。
对画线部分进行提问。
1. I go to school by bike.
2. I come from China.
3. I'm going to take a trip next week.
4. My father is a policeman.
5. He works in the police station.
6. I like swimming and diving.
支气管扩张()
A.双肺满布干啰音
B.局限性湿啰音
C.双肺满布湿啰音
D.两肺底湿啰音
E.局限性干啰音