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引言1981年,湖南省工程图学学会从北京师范大学赵擎寰教授处得到一个题目,这个题目是美国凯索教授寄给赵教授的,省学会在同年2月22日印发到全省会员研究,征求解
Introduction In 1981, Hunan Institute of Engineering Graphics got a title from Professor Zhao Qinghuan of Beijing Normal University. This topic was sent by Professor Cassault to Professor Zhao. The provincial association was distributed to members of the province on February 22 of the same year Solicit solution