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一种利用超声波调节焦距的新型照相机近来已在美国市场上销售。这种照相机使用时只要按动一个按钮,瞬间即可发出超声波,在不到三分之一秒时间内自动调节好焦距,拍摄后马上可取出色彩鲜艳、图像清晰的照片。超声波洗衣机日本一公司根据超声波能量集中,在液体中能产生高温和空化作用的原理,开发出一种新型超声波洗衣机。洗衣时,洗衣机把超声波
A new type of camera that uses ultrasound to adjust the focal length has recently been marketed in the United States. This camera can be used as long as a button press, an instant can be issued ultrasound, less than one-third of a second automatically adjust the focal length of the focal length, immediately after taking a colorful, vivid images. Ultrasonic washing machine A Japanese company based on the ultrasonic energy concentration in the liquid can produce high temperature and cavitation principle, developed a new type of ultrasonic washing machine. When washing clothes, the washing machine puts the ultrasound