A six-cylinder two-stroke/cycle diesel engine is fitted with a rotary distributing air st

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A six-cylinder, two-stroke/cycle diesel engine is fitted with a rotary distributing air starting systemThe speed of the rotating distributor disc is ________.

A.one-half engine speed

B.the same as engine speed

C.twice engine speed

D.four times engine speed

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