A centrifugal fuel oil purifier should be shut down if ________.A.more sealing water is ne

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A centrifugal fuel oil purifier should be shut down if ________.

A.more sealing water is needed

B.the cover clamp needs tightening

C.the purifier has a bad vibration when started

D.water is discharged from the overflow line

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗