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單項(xiàng)選擇題

Crank web deflection readings will give a positive indication of （）.

A.worn main bearing journals
B.torsional stress deformation
C.slack thrust bearings
D.bearing shells shim dimensions

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單項(xiàng)選擇題

A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.

A.contaminated with sludge
B.contaminated with carbon
C.diluted with fuel oil
D.diluted with water

單項(xiàng)選擇題

The emulsion of the oil is mainly caused by （）.

A.the solid impurities of large particle
B.the solid impurities of fine particle
C.the water content
D.both water and solid impurities