单项选择题

Portable foam type fire extinguishers are most effective on（）.

A.mattress fires
B.oil fires
C.wood fires
D.All of the above

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单项选择题
Portable fire extinguishers must be provided for the cargo tank area of an unmanned tank barge（）.

A.only when fully loaded
B.if one or more tanks are full
C.when transferring cargo
D.only when the barge is being towed
单项选择题
Portable CO2 fire extinguishers should NOT be used to inert a space containing flammable liquids due to the danger of（）.

A.the CO2 being inhaled by personnel
B.reflash of burning liquids
C.vapor condensation on the extinguisher
D.the discharge causing a static spark
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