单选题Why a gearbox is needed in a ship driven by a medium-speed diesel engine?（）ATo reduce the main engine speedBTo increase the main engine speedCTo govern the main engine speedDTo fix the propeller shaft
单选题
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
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