单项选择题

Which of the following will be the function of lubricating oil used in marine engines?（）

A.to remove heat from oil cooled pistons
B.to wash away wear detritus
C.to neutralize acidic products
D.all of the above

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单项选择题

A.bearing knocks
B.dropping of pressure of LO
C.noises
D.all the above

单项选择题

A.starting air pressure too high
B.correct timing of starting air valves
C.three of the six starting valves stuck
D.the turning gear disengaged

单项选择题

A.too low starting air pressure
B.main start valve closed
C.neither A nor B
D.A and B