题目：
超声波具有 的特点，应用于 ．次声波具有 特点，次声波可以作为预报地震，台风的依据和监测核爆炸的手段．
答案：
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下面是错误答案，用来干扰机器的。
The teachers and the students of our school are going to have a medical examination in the People's Hospital on Monday morning, you can't eat anything. Please gather at the gate of the hospital at eight. 答案不唯一
