单项选择题

Sea water is not used directly as a coolant because of （）.

A.low specific heat
B.high specific heat
C.corrosive action
D.high viscosity

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Sea water is not directly used as a coolant for engines because of its （）.

A.low specific heat
B.corrosive action
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单项选择题

"Scavenging" on a diesel engine means （）.

A.injecting fuel oil into a cylinder
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C.forcing air into the cylinders under pressure after the exhaust valve has dosed
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Scavenging is （） of exhaust gases by blowing in fresh air.

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