单项选择题
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.fresh water
B.sea water
C.cooling oil
D.emulsion
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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
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If there is water in fuel oil, the revolution of the engine will （）.
A.decrease
B.increase
C.be dismantled
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If the sump（）were to rise this would indicate water leakage into the oil an d an investigation into the cause must be made.
A.temperature
B.viscosity
C.lever
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