What is the speed of the crankshaft in a four－stroke／cycle engine when the camshaft is tur

What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm？.

A.375 RPM

B.500 RPM

C.750 RPM

D.1500 RPM

请帮忙给出正确答案和分析，谢谢！

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