单选题Before the sludge in a purifier is ejected,（）Athe oil feeding is stopped and replaced by admitting flushing waterBthe flushing water feeding is stopped and replaced by admitting oilCthe feeding of dirty oil and flushing water is stoppedDthe feeding of dirty oil and flushing water is admitted
单选题
Before the sludge in a purifier is ejected,（）
A
the oil feeding is stopped and replaced by admitting flushing water
B
the flushing water feeding is stopped and replaced by admitting oil
C
the feeding of dirty oil and flushing water is stopped
D
the feeding of dirty oil and flushing water is admitted
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