单项选择题
In a general oil cooler circulated by sea water, the oil is at a higher pressure, the result being that any leak in the cooler will mean a loss of （）.
A.oil
B.sea water
C.air
D.fresh water
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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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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
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单项选择题
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
