无规则干扰波
参考答案：
无一定频率，无一定视速度的干扰波，称为无规则干扰波。
Was it when you were attending high school _________you first listened to pop music?
A．when
B．that
C．which
D．where
化学水技术管理应建立、健全哪些技术档案？
