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單項(xiàng)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

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單項(xiàng)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

單項(xiàng)選擇題

（） is not properly set thus causing either advanced or retarded firing.

A.A piston
B.A fuel injection pump
C.A feed water pump
D.A lube oil pump

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