单项选择题
A.900kPa B.950kPa C.980kPa D.1000kPa
A.1100000h B.1200000h C.1300000h D.1400000h
A.600kPa B.650kPa C.700kPa D.750kPa
A.DC100V B.DC110V C.AC100V D.AC400V
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