单项选择题
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
单项选择题 A decrease in the flash point of diesel engine lube oil indicates the lube oil has become （）.
单项选择题 The emulsion of the oil is mainly caused by （）.
单项选择题 Impurities in the fuel oil will affect the operation of the engine, which has （） the use of separator and some other devices.
