Air or noncondensable gas is removed from a refrigeration system by a .A.separating chambe

A high temperature alarm or _____ which will melt is used to guard against the explosion of compressor air pipelines.

______no air or water, there would be no life in the world.A．There wasB．There wereC．Is the

Air is composed of ______ gas including hydrogen, oxygen and carbon dioxide.A．variedB．vari

Charging is the filling of the engine cylinder with a supply or charge of fresh air _____

Cross scavenging requires the fitting of _____ to prevent air or exhaust gas escape when t

_________(56)A.gas B.liquidC.solid D.air