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單項(xiàng)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

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單項(xiàng)選擇題

Charging is the filling of the engine cylinder with a supply of （） for compression.

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

單項(xiàng)選擇題

Cast iron carrier rings, （） machined grooves, are provided for all the pistons.

A.caulked into
B.caulking into
C.pressed into
D.screwed into