单项选择题
A.rubbing affected area with ice or snow
B.rubbing affected area briskly to restore circulation
C.wrapping area tightly in warm cloths
D.warming exposed parts rapidly
单项选择题 The rescuer can best provide an airtight seal during mouth-to-mouth resuscitation by pinching the victim’s nostrils and（）.
单项选择题 The principal personnel hazard unique to Halon extinguishers is（）.
单项选择题 The most effective warming treatment for a crew member suffering from hypothermia is（）.