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單項(xiàng)選擇題

In a four-stroke engines the camshaft rotates at （）.

A.half the engine rotational speed
B.twice the engine rotational speed
C.the engine rotational speed
D.four times the engine rotational speed

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單項(xiàng)選擇題

In a diesel engine, fuel must be broken up into a spray of fine droplets to （）.

A.increase its quality
B.obtain complete burning
C.reduce its weight
D.all of the above

單項(xiàng)選擇題

In a complete oil/water separator, more oil will separate out onto the underside of these plates and travel outwards until it is free to rise into the oil collecting space Whats the meaning of "it" in the sentence above?（）

A.a separator
B.oil
C.water
D.an oil collecting space