單項(xiàng)選擇題Which one of the followings might not be employed to create vacuum for flash type evaporator? ()

A.high-pressure steam-driven air-ejector
B.motor-driven vacuum pump
C.water-motivated air eductor
D.centrifuge pump


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3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題A centrifuge of which the bowl is arranged as the upper and lower parts separate discharges the sludge()

A.by opening the separator manually
B.by separating the lower part from the upper part automatically
C.by separating the upper part from the lower part automatically
D.continuously