右缘第二肋间触及收缩期震颤,最可能的是()
A.室间隔缺损
B.动脉导管未闭
C.肺动脉瓣狭窄
D.主动脉瓣狭窄
E.二尖瓣关闭不全
参考答案:D
Which of the following statements regarding depreciation methods is TRUE ()
A. Straight-line depreciation results in an increasing rate of return over the life of an asset.
B. Straight-line depreciation causes an increase in reported income over time.
C. Sinking fund depreciation is based on the theory that an asset generates an increasing rate of return over time.
给予一定声波刺激,在耳圆窗记录到的微音器电位,可以体现声音特性。