单项选择题
A.DC12V B.AC12V C.DC24V D.AC24V
A.220V±1V B.220V±2V C.220V±3V D.220V±4V
A.±30m B.±40m C.±50m D.±60m
A.DC24V B.AC24V C.DC30V D.DC36V
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