单项选择题
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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相关考题
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单项选择题
Which one is not true?（）
A.Two main areas of skill are involved in the construction of ship
B.There are distinct divisions in responsibilities between naval architects and marine engineers
C.Each ship will assume varying proportions according to its type
D.Ships can be divided into different categories from different perspectives -
单项选择题
The displacement of a ship is to the total weight, all told, of the relevant loaded ship（）
A.larger
B.equal
C.smaller
D.equivalent -
单项选择题
When a ship in loaded condition floats at arbitrary water line, its displacement is to the relevant mass of water displaced by the ship（）
A.equal
B.larger
C.smaller
D.equivalent
