单项选择题
A.2/3-3/4B.100ml-120mlC.1/2D.90ml-100ml
A.55B.50C.60D.65
A.5-6sB.6-7sC.7-8sD.8-9s
A.胸骨中断B.肋缘处C.两乳头连线的中点胸骨中下1/3
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