With some examples in plane geometry, the author indroduces how to use Desargues theorem to simplify the proofs of problems of collinear points and concurrent lines.
利用代沙格定理及其逆定理 ，对平面几何的几个共线点和共点线的问题给出简捷的证法。
Directed against the complexity of scheme design system of modularized flexible production lines an object oriented concurrent design system has been studied.
针对模块化柔性生产线方案设计系统的复杂性，研究了面向对象的并行设计系统。
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