" 谢谢提供的文件,非常有用但是我们的客户想知道更多.我们的面板显示（超声部分）范围是2-20,这个代表的是什么意思与位移和功率有什么联系."
" Thanks for the documents you have provided.They are very useful,but our clients want to know more.The scale of our panel display (ultrasonic part) is from 2 to 20.What does it represent and what is the relation with the displacement and power?"
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