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.

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  A . 60 to75 B . 80 to 95 C . 100 to 115 D . 120 to 135

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• 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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