单项选择题
A.边门处于已释放状态 B.边门处于可释放状态 C.边门无法释放 D.边门被切除
A.160N B.180N C.220N D.250N
A.900kPa B.950kPa C.980kPa D.1000kPa
A.1100000h B.1200000h C.1300000h D.1400000h
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