單項選擇題

A diesel engine piston ring face is in direct contact with the （）.

A.top of the ring groove
B.cylinder liner oil film
C.bottom of the ring groove
D.back of the ring groove

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If the water level dropped rapidly in the expansion tank of a closed diesel engine cooling water system, you should suspect a （）.

A.loss of suction in the circulating pump
B.leak in the primary cooling system
C.broken raw water pump shaft
D.burned or cracked piston in one cylinder

單項選擇題

In a simple mechanical governor, the （）.

A.centrifugal force rotates the ball-head
B.flyweight centrifugal force is balanced by spring force
C.flyweight centrifugal force is balanced by hydraulic pressure
D.speeder spring alone actuates the fuel control rod