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简述了高层建筑空气渗透的影响因素及特点，阐述了当量中和面法，介绍了利用ＡＵＴＯＬＩＳＰ语言编制的当量中和面法线算图，用一个算例说明了线算图的用法。
The influence factors and characteristics of air infiltration in high-rise buildings are briefly described. The equivalent neutralization surface method is described. The equivalent neutral surface normal map prepared by using AUTOLISP is introduced. The usage of line-graphics is illustrated by an example.