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本文通过教学实践，针对绘制网络图易发生的错误，提出用“抻线法”改绘基本网络图，寻求更准、快、好的方法。
Through teaching practice, this paper proposes to use the “line method” to repaint basic network diagrams in order to draw errors that may easily occur in network diagrams, and seeks for more accurate, faster, and better methods.