At present, the applied research of direct drawing method in a virtual endoscopic technique is also an urgent and an important task that need to solve.
而目前，直接绘制方法在虚拟内窥镜技术中的应用研究，又是一项亟待解决的重要任务。
In mountains area, when calculating and drawing the graph for protection area of lightning rod, we can use the direct graphic method.
在山坡地区，避雷针保护范围计算及作图可应用避雷针保护直接作图法。
A simple and convenient method of drawing indicates oblique plane, direction of projection, is given in this paper, making it more simple and direct as well as speedy to chart.
给出了双斜平面的一种简便的图示方法——“斜投影法”，使作图更加简捷、迅速。
A simple and convenient method of drawing indicates oblique plane, direction of projection, is given in this paper, making it more simple and direct as well as speedy to chart.
给出了双斜平面的一种简便的图示方法——“斜投影法”，使作图更加简捷、迅速。
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