单项选择题

If you find an extremely large refrigerant leak while using a halide torch, your flame will（）

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

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单项选择题

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

单项选择题

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

单项选择题

A.be clear
B.be blue
C.be light green
D.show bubbles