题目内容：
判断胸外心脏按压有效的标志是 （ ）A．瞳孔回缩
B．肌力恢复
C．听觉恢复
D．肋骨折断
E．股动脉搏动
参考答案：
选择题：判断胸外心脏按压有效的标志是 ( )A.瞳孔回缩B.肌力恢复C.听觉恢复 D.肋骨折断E.股动
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