A.正壓通氣頻率40~60次/分,吸呼比1:3 B.正壓通氣頻率40~60次/分,吸呼比1:2 C.胸外心臟按壓,應(yīng)按壓胸骨體中段,深度1~2cm D.胸外心臟按壓,應(yīng)按壓胸骨體下1/3處,深度2~3cm E.心臟按壓頻率100~120次/分,與通氣頻率比為3:1