单项选择题

For diesel engine piston cooling, lubricating oil can be supplied to the pistons by a/an （）.

A.oil spray
B.oil bath
C.oil control rings
D.drilled passage through the camshaft

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单项选择题
In a four-stroke cycle diesel engine, the camshaft rotates at （）

A.twice the crankshaft speed
B.half the crankshaft speed
C.the same speed as that of the crankshaft
D.a speed independent of that of the crankshaft
单项选择题
A restricted air intake to a diesel engine may result in the engine （）.

A.failing to reach rated speed
B.knocking under maximum load
C.hunting or surging under light load
D.overspeeding and running away
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