Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）<br>A:To reduce the main engine speed<br>B:To increase the main engine speed<br>C:To govern the main engine speed<br>D:To fix the propeller shaft

Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）
A:To reduce the main engine speed
B:To increase the main engine speed
C:To govern the main engine speed
D:To fix the propeller shaft

出自：海船船员证

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