对数声波阻抗
logarithmic acoustic impedance
声波阻抗技术
acoustic wave impedance technique
声波阻抗界面
acoustic impedance interface
3-D声波波动方程
3-D acoustic wave equation
比声阻抗
Specific acoustic impedance
标量声波波动方程
scalar acoustic wave equation
超声波声速测量
Ultrasonic velocity measurement
超声波声速计
ultrasonic wave velocimeter
超声波阻垢器
ultrarsonic scale inhibitor