在矩形小房间内，低音扬声器和传声器的位置互换后，测量得到的低音扬声器的频响曲线与互换前是一致的。
When positions of a microphone and a woofer are exchanged in a small rectangular room, a similar frequency response curve can be obtained.
提出一种基于改进的能量矩形平衡法的频率测量算法，给出框图程序。
A frequency measure algorithm based on the improved energy rectangular balance method was presented in this paper.
利用3维粒子动态分析仪（3D-PDA）测量了矩形截面三分支管试验件的3维速度场，以验证改进后的程序软件的可靠性；
The three dimensional velocities of the manifold junction with a rectangular section were measured by use of three dimensional particle dynamic analyzer (3D PDA) to verify the modified KIVA program.
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