单项选择题
A.speed setting B.load setting C.speed changing D.load changing
In engines with system, the lubricating oil can be adde...
单项选择题In engines with system, the lubricating oil can be added to the engine through the filling hole in the crankcase cover, by using a hand oil can, or through the separator pipe（）
A.lubricating oil B.dry sump C.circulated tank D.wet sump
Main engines as well as auxiliary engines operating on ...
单项选择题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
These acid residues must be prevented from entering the...
单项选择题These acid residues must be prevented from entering the crankcase, otherwise the lube oil would be（）
A.contaminated B.emulsified C.deteriorated D.oxidated
