主动脉瓣狭窄最主要的特征（） ["A.心脏向左下扩大极明显","B.胸骨左缘第3、4肋间有舒张期高调递减型杂音","C.周围血管征","D.AustinFlint杂音","E.主动脉瓣区喷射性杂音伴第二心音减弱或消失"] 符合二尖瓣狭窄合并主动脉瓣关闭不全的体征是（） ["心尖区收缩期杂音，主动脉瓣区舒张期哈气样杂音","心尖区舒张期杂音，主动脉瓣区舒张期哈气样杂音","心尖区开瓣音，主动脉瓣区收缩期杂音","心尖区AustinFlint杂音，主动脉瓣区舒张期哈气样杂音","心尖区收缩期喀喇音，主动脉瓣区舒张期哈气样杂音"] 左心衰竭的特征性体征有（） ["肺部哮鸣音","交替脉","颈静脉怒张","肝肿大","下肢水肿"] 肝颈回流征阳性见于（） ["右心室肥厚","肺气肿","右心衰竭","肝硬化","左心衰竭"] 右心衰竭可靠的体征为（） ["右心室肥厚","肺气肿","三尖瓣反流性收缩期杂音","肝脏肿大","肝颈回流征阳性"] 二尖瓣狭窄只有舒张中期隆隆样杂音，而无舒张晚期杂音是因为可能（）