What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）<br>A:375 RPM<br>B:500 RPM<br>C:750 RPM<br>D:1500 RPM

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

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