A diesel engine emits blue exhaust smoke as a result of ___________.A.cold intake airB.exc

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A diesel engine emits blue exhaust smoke as a result of ___________.

A.cold intake air

B.excessive compression pressure

C.excessive cylinder lubrication

D.a light load

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