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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

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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

單項(xiàng)選擇題

Blow-off of the relief valves of the engines cylinders may be caused by （）.

A.too low lead
B.water in fuel
C.too tight spring
D.leakage