单项选择题

（） providing lubricating films, oil used in marine diesel engines have to remove heat from oil cooled piston.

A.Except for
B.Beside
C.Except
D.In addition to

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单项选择题

A.An air pump
B.A compressor
C.A fuel pump
D.A priming

单项选择题

A.The detergency；the alkalinity
B.The alkalinity；the detergency
C.The inhabitant；the water
D.The additives；the distilled water

单项选择题

A.An air receiver
B.An operating valve
C.An automatic valve
D.An air distributor