In this paper, the disadvantages of standard arithmetic are pointed out, and a new method is given to improve inverse order for FFT with high efficiency, the standard arithmetic is also optimized.

文中指出了这个算法的缺陷，提出了改进方法，明显地提高了整序效率，使FFT标准整序算法得到优化。

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This method is easy to be completed on computer, and applicable to solve the inverse of high-order matrices.

方法简单，运算过程规律，和其它求逆方法比较还具有精度高的特点，适合于高阶矩阵之逆，更便于上机计算。

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In order to ensure the efficiency and service life of screw drilling tools, an inverse inspection method for screw drilling tools driven by hydraulic motor is investigated.

为了确保螺杆钻具的效率和使用寿命，研究了采用液马达驱动的螺杆钻具逆向检测试验法。

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