单项选择题
A.等于5.8 B.等于5.9 C.等于6.1 D.等于6.2
A.220V±1% B.220V±3% C.220V±4% D.220V±5%
A.380V±1% B.380V±2% C.380V±3% D.380V±5%
A.5 B.10 C.15 D.20
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