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單項(xiàng)選擇題

Compressed air is used on board ship （）.

A.for starting diesel engines
B.in pneumatic control system
C.in pneumatic tools
D.All the above are true

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單項(xiàng)選擇題

Compressed air is supplied by air compression to （）.

A.the air receivers
B.the starting valves
C.the cylinder covers
D.the distributors

單項(xiàng)選擇題

Charging-air pressure increases if there is incorrect combustion and drop in the （） of the diesel engine.

A.machine efficiency
B.machinery efficiency
C.mechanical efficiency
D.mechanics efficiency

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