晶闸管二端并接阻容吸收电路可起哪些保护作用?
参考答案:
(1)吸收尖峰过电压
(2)限制加在晶闸管上的du/dt值
(3)晶闸管串联应用时起动态均压作用
Of all my friends ____will be able to persuade Tom to change his mind. He is so firm upon it.
A.some
B.anyone
C.none
D.neither
无人值班的变(配)电所电力电缆线路、每()检查一次。
A.天
B.周
C.月
D.年