单选题When used to fight fire，carbon dioxide（）.Ais effective if used promptly on an oil fireBhas a greater cooling effect than waterCis lighter than airDis harmless to cargo and crew
单选题
When used to fight fire，carbon dioxide（）.
A
is effective if used promptly on an oil fire
B
has a greater cooling effect than water
C
is lighter than air
D
is harmless to cargo and crew
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