A.96%~99% B.90%~96% C.60%~90% D.70%~85%
(A)S1N=S2N (B)S1N>S2N (C)S1N<S2N (D)不一定
A.切斷電源 B.空載運(yùn)行 C.輕負(fù)載運(yùn)行 D.負(fù)載運(yùn)行