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

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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
单项选择题
（） 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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