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

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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

单项选择题

Bridge gauge can be used to measure （） of a diesel engine.

A.diameters of journals
B.deflections of crankwebs
C.diameters of crankpins
D.none of the above

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Blow-off of the relief valves of the main cylinders during operation indicates （）.

A.the cylinder cover is cracked
B.the injector holes is clogged
C.the cams are not properly set
D.fuel pump is leaking