The principal personnel hazard unique to Halon extinguishers is（）.

The most effective warming treatment for a crew member suffering from hypothermia is（）.

A.running or jumping to create heat
B.lying in the sun
C.a warm water bath
D.mouth-to-mouth resuscitation

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The danger associated with using carbon dioxide in an enclosed space is（）.

A.frostbite
B.skin burns
C.asphyxiation
D.an explosive reaction

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