问题:
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
● 参考解析
本题暂无解析
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