单项选择题

Fuel oil is thought to be one of the main factors （） the operation and maintenance of an engine.

A.have nothing to do with
B.having nothing to do with
C.have much to do with
D.having much to do with

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单项选择题

A.a transfer pump
B.a bilge pump
C.a service pump
D.a vacuum pump

单项选择题

A.a failure of the motor
B.a failure of lubricator
C.a failure of cylinder
D.a failure of fuel pump

单项选择题

A.the motor
B.the fresh water generator
C.the governor
D.the fuel pump