單項(xiàng)選擇題In a diesel engine, offers the heat energy directly(); works as working medium and changes the heat energy to mechanical energy()

A.the burning of the fuel; medium shaft
B.fuel spray; fresh air
C.fuel; fuel spray
D.the burning of the fuel; the burned gas mixture


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2.單項(xiàng)選擇題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

3.單項(xiàng)選擇題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

4.單項(xiàng)選擇題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

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()are used to digest the sewage to produce innocuous sludge in a biological sewage treatment plant.

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Which of the diesel engine components listed increase air density and helps to improve engine operating efficiency?()

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