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單項選擇題

（） 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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單項選擇題

（） 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

單項選擇題

（） 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