英译汉：gearbox

1、Why a gearbox is needed in a ship driv

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

2、英译汉：wind vane

英译汉：wind vane

3、英译汉：output

英译汉：output

4、英译汉：hot

英译汉：hot

5、英译汉：main shaft

英译汉：main shaft

6、英译汉：battery

英译汉：battery