单项选择题

（） provide the water to the pistons.

A.Pneumatic pipes
B.Hydraulic pipes
C.Telescopic pipes
D.Operating gas pipes

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单项选择题
（） is used for washing and drinking.

A.The ballast system
B.The salt water system
C.The bilge system
D.The domestic system
单项选择题
（） 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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