单项选择题
A.-5%～+5% B.-10%～+10% C.-15%～+15% D.-20%～+20%
A.31 B.28 C.30 D.20
A.2400 B.4800 C.1200 D.9600
A.110V/220V B.57.7V/110V C.57.7V/220V D.220V/380V
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