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Ultrasound is a mechanical wave with an extremely short wavelength. It has the characteristics of high frequency, short wavelength, and small diffraction phenomenon. It can propagate directionally and being reflectet when it encounters obstacles. In nature, bats judge and avoid obstacles by emitting
+On November 20th, the World Cup 2022 began in Qatar. As the host,Qatar put on a wonderful and technological opening ceremony for the world. thousands of UAVs sparkling in the sky, played an impressive aerial show changing a variety of patterns such as the "Hercules Cup, the World Cup Official Emblem
+Ultrasound is a mechanical wave with wavelength less than 2cm, which is characterized by high frequency, short wavelength and small diffraction phenomenon. In industrial production, there are more and more applications of ultrasonic ranging. Among them, ultrasonic liquid level measurement technology
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