The latent heat of water vapor in air is dependent upon the （）

A.change from blue to orange
B.‘flare up’ and remain lighted
C.probably go out
D.stay blue

A.flushed with clean refrigerant oil
B.purged with the refrigerant
C.washed with an ammonia and alcohol solution
D.grounded to compressor

A.petroleum crystals
B.phosgene gas
C.water vapor
D.carbon monoxide