A centrifugal fuel oil purifier should be shut down if （）<br>A:more sealing water is needed<br>B:the cover clamp needs tightening<br>C:the purifier has a bad vibration when started<br>D:water is discharged from the overflow line

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

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