單項選擇題In a central cooling system, used in some modem ships, sea water is supplied to cool （）which will circulate to other individual cooler, greatly reducing the corrosion problems.

A.main bearings
B.sea water
C.cooling oil
D.lower temperature fresh water


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2.單項選擇題In a （） engine the charge of air in the cylinder before compression commences is above atmospheric pressure.

A.pressure charged
B.naturally aspirated
C.contaminated
D.high speed diesel

3.單項選擇題If there is water in fuel oil, the revolution of the engine will （）.

A.decrease
B.increase
C.be dismantled
D.be reassembled

5.單項選擇題If the needle valve in a fuel injection nozzle sticks open （）.

A.no fuel will be delivered through the nozzle
B.the nozzle will overheat and crack
C.time of injection will change
D.fuel will leak into the drain line