Should a person be overcome due to lack of oxygen and high concentration of refrigerant t

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Should a person be overcome due to lack of oxygen and high concentration of refrigerant, treat with_____.

A.fresh water

B.fresh air

C.salt water

D.artificial respiration

请帮忙给出正确答案和分析,谢谢!

热搜:a是b的充分条件,b是a的必要条件吗