Austin-Flint杂音是指主动脉瓣膜关闭不全时相对性二尖瓣狭窄引起的舒张期柔和的舒张早、中期隆隆样杂音。（）
参考答案：对
债券型基金的久期越长，净值的波动幅度就越大，所承担的利率风险就越高。( )
_______ you told me, I heard nothing of what happened.
[ ]
A. Until
B. After
C. If
D. Since
