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單項(xiàng)選擇題
In a disk-type lubricating oil purifier, （）
A.the purifier driving gears are lubricated by the reclaimed
B.oil as it leaves the bowl all dirt and sludge are automatically discharged with the cooling water
C.sealing water must never be supplied until after oil is fed to the unit
D.deterioration of the bowl ring gasket will cause the purifier to lose its water seal
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