單項選擇題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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1.單項選擇題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

2.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

4.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