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單項(xiàng)選擇題

The diesel engine valve subjected to most severe conditions of service is the （）.

A.cylinder exhaust valve
B.air starting valve
C.air inlet valve
D.cylinder relief valve

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單項(xiàng)選擇題

A piston in a four-stroke/cycle diesel engine makes four strokes during each （）.

A.crankshaft revolution
B.mechanical cycle of operation
C.period of two combustion cycles
D.cycle of two events

單項(xiàng)選擇題

The effective stroke of a constant-stroke, individual, fuel injection pump is varied by the （）.

A.control rack
B.delivery valve
C.governor speed
D.plunger crossbar

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