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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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出自：海船船员证

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