高压熔断器是电路电流超过规定值并经一定时间,使其熔体而分断电流、断开电路的保护电器。
高压隔离开关(QS):隔离高压电源、保证设备和线路的安全检修 ,不能接通和切断负荷电流。
1. Do you have experience of the bad manners described in the text? How do you feel when other people show bad manners?2. Do you agree that "courtesy is no longer respected" and it's "stuffy to be polite"?Why? / Why not?