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单选题
When choosing extinguishers to fight a Class “B” fire do NOT use（）.
A
carbon dioxide
B
dry chemical
C
foam (stored-pressure type)
D
water (cartridge-operated)
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One man report the fire, and the other two men fight the fireB
One man report the fire, one man fight the fire, and one man evacuate and secure the areaC
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单选题When used to fight fire，carbon dioxide（）.A
is effective if used promptly on an oil fireB
has a greater cooling effect than waterC
is lighter than airD
is harmless to cargo and crew
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单选题Portable fire extinguishers must be provided for the cargo tank area of an unmanned tank barge（）.A
only when fully loadedB
if one or more tanks are fullC
when transferring cargoD
only when the barge is being towed
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