There should be a lubricating oil （） b

1、Burning diesel oil should be treated a

Burning diesel oil should be treated as which class of fire?（）AClass "A"BClass "B"CClass "C"DClass "D"

2、When should a fire be ventilated?（）

When should a fire be ventilated?（）AWhen attacking the fire directlyBWhen using a steam smothering systemCWhen using the fixed CO2 systemDAll of the above

3、Oil product samples should be taken fr

Oil product samples should be taken from the（）.Adock riserBship's cargo tanksCshore tank dischargeDAll of the above

4、The （） of the lubricant should be suff

The （） of the lubricant should be sufficient to hold the film together, but it should allow the lubricant to flow easily.Aspecific gravityBviscosityCacid valueDcalorific value

5、A compressor should never be stopped （

A compressor should never be stopped （）.Awithout first cooling itBwithout first heating itCwithout first unloading itDwithout first loading it

6、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