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單項(xiàng)選擇題

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

A.low specific heat
B.corrosive action
C.high expense
D.acid property

單項(xiàng)選擇題

"Scavenging" on a diesel engine means （）.

A.injecting fuel oil into a cylinder
B.removing exhaust gases from the cylinder
C.forcing air into the cylinders under pressure after the exhaust valve has dosed
D.a combination of all the above