使用胸外心脏挤压法救助婴幼儿时,要垂直向下用力。
A.正确
B.错误
正确答案是A
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Passage Two Tight-lipped elders used tosay,"It's not what you want in this world but what you get that matters."Psychology teaches that you do get what you want if you know what you wantand want the right things. &en