FIG. 3. Wavefronts of the sound pressure due to a point source located at the point x50 and y50 for M x50 and y50 for M50.3. The medium velocity is in the direction of the x-axis. 0.3. The medium velocity is in the direction of the x-axis 0.3. The medium velocity is in the direction of the x-axis声源静止,媒质延X轴方向运动.
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