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單項(xiàng)選擇題

The lube oil pump used in a diesel engine is a （）.

A.volute pump
B.centrifugal pump
C.diaphragm pump
D.gear pump

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單項(xiàng)選擇題

Most fuel injection nozzles are opened by （）.

A.fuel oil pressure
B.a cam operated follower
C.a spring-loaded pressure plate
D.timing gears keyed to the crankshaft

單項(xiàng)選擇題

The total starting air capacity required for reversible main engines is to be sufficient for at least （）.

A.six consecutive starts
B.eight consecutive starts
C.ten consecutive starts
D.twelve consecutive starts