单项选择题

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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单项选择题
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
单项选择题
Charging is the filling of the engine cylinder with a supply of （） for compression.

A.water
B.fresh air
C.fuel oil
D.gas
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