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單項選擇題

（） is used for washing and drinking.

A.The ballast system
B.The salt water system
C.The bilge system
D.The domestic system

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（） at the end of the distribution pipe ensures that adequate pressure is maintained by the pump.

A.A relief valve
B.An alarm
C.A pressure gauge
D.A non-maim valve

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（） allows for expansion and water make up in the water cooling system.

A.A top tank
B.A head tank
C.A head valve
D.A drain tank