A.轉(zhuǎn)/小時
B.轉(zhuǎn)/分
C.轉(zhuǎn)/秒

A.0.01s
B.0.02s
C.50s
D.100s

A.70%
B.80%
C.90%
D.100%

A.電阻值
B.端電壓
C.阻抗
D.電源內(nèi)阻