The process to remove exhaust gases by

1、（）is the process by which the position

（）is the process by which the position of the vessel at any moment is found by applying the last well-determined position to the run that ...

2、The exhaust gases for a new engine sho

The exhaust gases for a new engine should be （） when the engine operates under full load.AsmokyBa little bit denseCvisibleDalmost invisible

3、When to remove scale from the cooling

When to remove scale from the cooling spaces, acid solution （） in the system can be tested from time to time by putting some on to a piece of lime.AstrengthBdenseCpercentageDvelocity

4、The atmosphere（）certain gases mixed to

The atmosphere（）certain gases mixed together in definite proportions.Acomposes ofBis made upCconsists ofDmakesup of

5、To lubricate the swivel or remove corr

To lubricate the swivel or remove corrosion from a fire hose coupling，you should use（）.AglycerineBgraphiteCkeroseneDfresh water and soa

6、It is necessary to remove （） from the

It is necessary to remove （） from the cooling spaces.AscarBscaleCspurDbilge