单项选择题
A.≤0.85m/s3 B.≤0.70m/s3 C.≤0.75m/s3 D.≤0.80m/s3
A.680kPa B.750kPa C.600kPa D.900kPa
A.DC24V B.DC220V C.DC1500V D.DC110V
A.DCU B.EDCU C.BCU D.EBCU
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