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1.前言反映当今世界新技术革命的重要标志之一——CAD技术近十多年来发展极为迅速,并正以每年30％的销售额增长率向更高的水准推进。CAD所创造的生产力不但不再为人们所怀疑,而且以令人信服的高效率、高质量和高精度广为各个工程界所接受和应用。说到CAD的特点与长处,在这里不妨回顾一下美国“空间实验室”(SKYLAB)的发展过程。从六十年代中期发展起来的SKYLAB,在一九七一年的一次试验中发生了灾难性的事
1. Introduction One of the important symbols that reflect the new technological revolution in the world today - CAD technology has developed extremely rapidly in the past decade and is moving to a higher standard with an annual sales growth rate of 30%. Not only is the productivity created by CAD no longer suspicious of people, but also widely accepted and applied by various engineering sectors with convincing high efficiency, high quality and high precision. Speaking of the characteristics and advantages of CAD, here may wish to review the development of the United States “space laboratory” (SKYLAB). SKYLAB, which developed from the mid-1960s, suffered a catastrophic event in a pilot in 1971