并使用连续性方程，在考虑表面复合过程的情况下，提出了短二极管的少子寿命计算公式。
This paper calculates the expression between minority-carrier lifetime and switching time in short diode by analyzing the continuity equation when considering the surface recombination.
本文从滚动轴承寿命公式的基本前提出发，推导出了谐波齿轮传动中柔性轴承的寿命计算公式。
Going on the basic premise of the life formula for common bearings, the author deduces the life formula for the flexible bearings used in harmonic gear transmission.
指出了影响锅炉对流受热面剩余寿命计算公式的应用前提，分析了由于燃煤质量的下降，造成受热面磨损的原因。
The calculate formula premise of the residual life of boiler convection heating surface is pointed out, and the cause of heating surface wearing due to the quality decline of coal is analyzed.
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