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重点介绍了ＧＢ／Ｔ１４６９２－９３有关第一角画法和第三角画法的规定；对比了第一角画法与第三角画法的异同；通过实例说明了第三角投影的特点及其应用方法。
Introduces the provisions of GB / T14692-93 about the first angle painting method and the third angle painting method; compares the similarities and differences between the first angle painting method and the third angle painting method; and illustrates the characteristics of the third angle projection method and its application .