可控硅除用于整流电路外，还用于调压、变频、逆变等方面。
参考答案：对
B．nm/k倍
C．mk/n倍
D．nkm倍
A．He can’t remember people by sight.
B．He can’t remember people by name.
C．He has a terrible memory for football.
D．He has a hard time recognizing names.
