（） is not properly set thus causing either advanced or retarded firing.<br>A:A piston<br>B:A fuel injection pump<br>C:A feed water pump<br>D:A lube oil pump

（） 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

出自：海船船员证

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