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患者女,心悸,劳力性呼吸困难,诊断为二尖瓣狭窄,其杂音与相对性狭窄的杂音相鉴别,支持后者的是().
A . 常无房颤
B . 常有拍击性S
1
C . 常有心尖区震颤
D . 常有开瓣音
E . 舒张期隆隆样杂音
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