此文把通常进位制的概念扩张成复数进位，且由复数进位给出了一类纯粹由数学定义引出的分形。
We first extend the concept of ordinary number system, and study the complex number numeration. Then we give an example of fractal by the complex number numeration.
从双口网络的Z参数、Y参数出发，推导了星形、三角形网络转换在正弦稳态电路中的转换公式，引出其应用条件。
In this paper, starting from the conversion of Z parameters and Y parameters of two-port parameters, we deduce the formulas of wye-delta network transformation in sinusoidal steady-state.
因此弯矩在形心处要引起正应力，从而引出所谓“等效轴力”的概念。
Therefore, the bending moment may cause normal stress at the axis of gravity, and the concept of "equivalent axial force" is induced.
应用推荐