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

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！