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单选题
In a closed cooling water system, which of the problems can cause the water pressure to fluctuate?（）
A
An open vent in the cooling system
B
A fouled sea chest
C
A restricted water passage in the engine
D
Air entrained in the cooling water
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单选题In the closed cooling system, the water （）.A
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单选题The device allowing for the change in volume of the cooling water in a propulsion diesel engine closed cooling system is the （）.A
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