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【单选题】
Mark-6型曲轴箱油雾浓度监视报警系统的传感器探头更换时应注意__。A.
关闭整个系统的电源
B.
在新的探头上设置与旧探头完全相同的地址
C.
检查4个风机弹簧及固定销的状态,需要时更换坏损件
D.
安装新传感器前,用吹灰器吹出内部杂质并吹干内部单元
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【单选题】听力原文：F: Is this your book, Steven? M: No, it isn't mine. It's Sam's. Whose book is it?
A.
It's Sam's.
B.
It's Steven's.
C.
It's mine.
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