單項選擇題

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

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單項選擇題

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

單項選擇題

In a commonly used fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.

A.a service tank
B.a settling tank
C.an expansion tank
D.a double bottom tank

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