When used to fight fire，carbon dioxide（）.<br>A:is effective if used promptly on an oil fire<br>B:has a greater cooling effect than water<br>C:is lighter than air<br>D:is harmless to cargo and crew

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

出自：海船船员证

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