单项选择题

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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单项选择题

A.use different fire hose pressures
B.use fire hoses of different sizes
C.not attack the fire from opposite sides
D.not wear protective clothing

单项选择题

A.First aid kit
B.Axe or cutting torch
C.Fire extinguisher
D.Chafing gear

单项选择题

A.When attacking the fire directly
B.When using a steam smothering system
C.When using the fixed CO₂ system
D.All of the above