单选题What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）A375 RPMB500 RPMC750 RPMD1500 RPM
单选题
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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