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單項選擇題

In a commonly used fuel oil system, the oil is stored in tanks in the double bottom from which it is pumped to （） and heated.

A.a service tank
B.a settling tank
C.an expansion tank
D.a double bottom tank

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單項選擇題

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.main bearings
B.sea water
C.cooling oil
D.lower temperature fresh water

單項選擇題

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