Why a gearbox is needed in a ship driven by a medium-speed diesel engine？ .A.To reduce the

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

请帮忙给出正确答案和分析，谢谢！

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