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chaoshengbo
- 超声波测距仪：通过超声波发送和接受探头，发送和接受超声波算出时间，再乘上速度再除以2，即可求出距离-Ultrasonic range finder: send and receive through the ultrasonic probe, sending and receiving ultrasound to calculate the time, and then divided by the speed multiplied by 2, can be obtained from the