单项选择题

If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.

A.525 RPM
B.775 RPM
C.1550 RPM
D.1800 RPM

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船舶动力装置

If a four-stroke/cycle diesel engine is running at 1550 RPM, the speed of the camshaft will be（）.