叙述视觉极限对比测试仪的原理，介绍该仪器系统的设计过程，给出仪器性能参数的实际测试结果。
The principle of vision limit comparison tester is described. The design process and tested results of the tester performance parameters are given.
通过实例分析了工装设计中采用极限计算法估算误差的缺陷，介绍了瑞利计算法的原理及计算实例。
The defect of limit algorithm during estimating errors in the design of processing equipment is analyzed by examples. The principle and calculating examples of Rayleigh algorithm are introduced.
以钢结构设计原理中的极限状态设计法或容许应力法为基础，阐述了预应力加固钢结构的分阶段加固设计计算原理和方法。
Based on limit-state design method in steel structure design principle, the principle and method of phased strengthening design of steel structures strengthened by prestressing is represented here.
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