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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相关考题
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单项选择题
When two fire hose teams are attacking a fire they should（）.
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
When towing astern what equipment should be stowed ready for use near the towline?（）
A.First aid kit
B.Axe or cutting torch
C.Fire extinguisher
D.Chafing gear -
单项选择题
When should a fire be ventilated?（）
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
