题目内容
The standing wave usually appears due to the interference between the incident wave and reflected wave after the _______________ of progressive wave by vertical boundaries.
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_________________ are fast and long waves generated by seismic events such as underwater fault movement (错层运动).
The wave base is equal to ____________ the wavelength measured from still water level.
The _________________ is the distance between repeating units of a wave pattern.
按病因学分类，临床最常见的肺炎是
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