频率误差的分类有哪几种？
参考答案：
频率误差分为幅值频率误差和相位角频率误差。
Several passages were found _________ when the book _________ me.
A．missing; returned
B．lost; was returned
C．gone; was returned to
D．disappeared; was returned to
多发生于较细的支气管，一种音调高而尖的为（）
A.鼾音
B.捻发音
C.哮鸣音
D.哨笛音
E.湿性啰音（水泡音）
