Echo Sounder is a kind of acoustic measuring depth equipment, which can measure depth with the time between transmitted wave and echo on condition in which the speed of ultrasonic is fixed.
回声测深仪是用来测量水深的一种声学测量设备，其以水中超声波的传播速度为确定条件，利用发射波与反射回波时间差来测量水深。
The experiment research on the forward scattering of airborne radar transmitted wave with airscrews is presented in this paper.
本文就飞机螺旋桨对机载雷达发射波前向散射的实验研究情况作了介绍。
The experiment research on the forward scattering of airborne radar transmitted wave with airscrews is presented in this paper.
本文就飞机螺旋桨对机载雷达发射波前向散射的实验研究情况作了介绍。
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