单项选择题
A.30-35次/min B.35-40次/min C.40-45次/min D.40-60次/min
A.18-20cmH2O B.20-25cmH2O C.25-30cmH2O D.10-15cmH2O
A.胸外按压 B.正压通气 C.鼻导管给氧 D.气管插管
A.10s B.20s C.30s D.40s
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