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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单项选择题

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

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

单项选择题

Care and cleanliness are required when installing diesel fuel filters （）.

A.to prevent the fuel system from becoming air-hound
B.to prevent the fuel system becoming clogged with dirty particles
C.both of the above
D.to prevent the lubricating oil from leaking out of the filter element