单项选择题
A.The ballast system B.The salt water system C.The bilge system D.The domestic system
（） at the end of the distribution pipe ensures that ade...
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
（） allows for expansion and water make up in the water ...
单项选择题（） 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
（） rods are not in proper condition so that too much fu...
单项选择题（） rods are not in proper condition so that too much fuel is supplied to the corresponding cylinder.
A.Piston B.Sounding C.Regulating D.Connecting
