CAD (Computer Aided Design) software is the third largest software after operating system and office software, but compared with foreign counterparts, domestic software vendors in this field seem to have been obscured. For a long time, products of Autodesk and other companies have been Occupy most of China's market, but now, a group of domestic CAD manufacturers led by Zhongwang Longteng Company have begun to exert their strength, just ending
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