單項(xiàng)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

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單項(xiàng)選擇題

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

單項(xiàng)選擇題

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

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