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[单选题]
胸外心脏按压和人工呼吸的比例为()
A.0.625694444432156
B.1.25138888888889
C.0.0520833333430346
D.0.104166666656965
![](https://lstatic.shangxueba.com/sxbzda/h5/images/tips_org.png)
A.0.625694444432156
B.1.25138888888889
C.0.0520833333430346
D.0.104166666656965
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