单项选择题
A.全厂停电B.仪表气压力低C.蒸汽压力低D.氧气压力低
A.9.0MPaB.8.7MPaC.7.5MPaD.6.7MPa
A.25SB.36SC.3600SD.5400S
A.12VB.24VC.36VD.220V
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