单选题Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles（）AfilteringBcentrifugingCdepositingDoperating
单选题
Main engines as well as auxiliary engines operating on heavy fuel should have continuous on the lubricating oil, either according to the bypass or batch principles（）
A
filtering
B
centrifuging
C
depositing
D
operating
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