皮皮学，免费搜题
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【单选题】
主动脉瓣第二听诊区位于
A.
在胸骨左缘第3肋间
B.
在胸骨左缘第2肋间
C.
在胸骨下端左缘，即胸骨左缘第4、5肋间
D.
位于心尖搏动最强点，又称心尖区
拍照语音搜题，微信中搜索"皮皮学"使用
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