If a diesel engine starts firing but is unable to come up normal speed either without lo

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If a diesel engine starts firing, but is unable to come up normal speed, either without load or even under a small load, the cause may be ___________.

A.insufficient fuel supply

B.faulty governor

C.high exhaust back pressure

D.all of the above may cause this problem

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗