单项选择题
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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A.increase its quality
B.obtain complete burning
C.reduce its weight
D.all of the above -
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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?（）
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D.a double bottom tank
