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.