单选题Halon gas will decompose and may form very hazardous toxic fumes when discharged（）.Adirectly on flamesBat room temperatureCin an extremely cold climateDNone of the above
单选题
Halon gas will decompose and may form very hazardous toxic fumes when discharged（）.
A
directly on flames
B
at room temperature
C
in an extremely cold climate
D
None of the above
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