What is the speed of the crankshaft in a four-stroke/cycle engine when the camshaft is turning at 750 rpm?（）
- A375 RPM
- B500 RPM
- C750 RPM
- D1500 RPM
问题
What is the speed of the crankshaft in
参考解析：
分类：船舶动力装置题库,海船船员考试题库
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