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單項選擇題

Compressed air is supplied by air compression to （）.

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

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單項選擇題
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
單項選擇題
Charging is the filling of the engine cylinder with a supply or charge of fresh air （） compression.
A.to need
B.ready for
C.want to
D.going to be