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單項選擇題

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

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

單項選擇題

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