单项选择题
A.160N B.180N C.220N D.250N
A.900kPa B.950kPa C.980kPa D.1000kPa
A.1100000h B.1200000h C.1300000h D.1400000h
A.600kPa B.650kPa C.700kPa D.750kPa
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