“sonic ranging”可以造什么句，sonic ranging造句
来源：语文精选馆 1.65W
Echolocation calls are usually ultrasonic ranging in frequency from 20 to 200 kilohertz (kHz), whereas human hearing normally tops out at around 20 kHz.
An ultrasonic ranging system is designed for creeping robot to avoid obstacle, which measures the distance by time-of-flight.
