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【单选题】
有关成年人胸外心脏按压，下列正确的是（ ）A.
按压部位在胸骨下段，剑突上2.5～5cm处
B.
按压时以使胸骨下陷2cm为度
C.
应用冲击或猛压，下压时间与放松时间比为2：1
D.
按压频率以30次／min为宜
E.
放松时手掌根离开胸骨
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A.
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B.
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C.
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D.
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