超声波传播速度
Ultrasonic wave velocity
ultrasonic propagation speed
超声波特性参量
ultrasonic characterization
声传播特性
wave transmission characteristics
波传播特性
characteristics of wave propagation
电波传播特性
radio waves propagation characteristics
Radio wave propagation characteristic
超声波声速测量
Ultrasonic velocity measurement
超声波声速计
ultrasonic wave velocimeter
多超声波传感器系统
multi-ultrasonic sensor system
multi--ultrasonic sensor system
环形行波超声波电机
ring-type traveling-wave ultrasonic motor