The pour point of lubricating oils is

1、The removal of （） from lubricating oil

The removal of （） from lubricating oil will reduce engine wear and possible breakdowns.Acontaminating waterBcontaminated additivesCcontaminated fuelDcontaminating impuritie

2、The term "pour point" is defined as th

The term "pour point" is defined as the lowest temperature at which lubricating oils will flow （）.ArapidlyBby gravityCthrough a standard orifice at a specified temperatureDat a rate of 60cc per second

3、The ability of lubricating oils to res

The ability of lubricating oils to resist viscosity changes during temperature changes is indicated by the（）AAmerican PetroleumBInstitute number viscosity index numberCSeconds Saybolt Furol numberDSeconds Saybolt Universal number

4、The selection of a lubricating oil dep

The selection of a lubricating oil depends to a great extent on the operating conditions,（）.Athe type of coolantBthe design of the engineCthe type of fuel to be burnedDB and C

5、The amount of lubricating oil in the d

The amount of lubricating oil in the drain tank should be checked by （）.AmeasuringBsounding rodCmeteringDweighting

6、The specific gravity of fuel oil is a

The specific gravity of fuel oil is a （）.Aabsolute valueBrelative valueCconstant valueDset value