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（）.
A.cupping a hand around the patient's mouth
B.keeping the head elevated
C.applying his mouth tightly over the victim's mouth
D.holding the jaw down firmly
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相关考题
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The principal personnel hazard unique to Halon extinguishers is（）.
A.displacement of oxygen
B.skin irritation
C.inhaling toxic vapors
D.eye irritation -
单项选择题
The most effective warming treatment for a crew member suffering from hypothermia is（）.
A.running or jumping to create heat
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单项选择题
The danger associated with using carbon dioxide in an enclosed space is（）.
A.frostbite
B.skin burns
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