Trapezoidal no volume! It is a planar graph!
梯形没有体积！它是一个平面图形！
The (4,6)-regular maximum planar graph is studied, and its existence condition and construction method are obtained respectively.
本文讨论了（4，6）-正则极大平面图，得到了（4，6）-正则极大平面图的存在条件及构造方法。
In this paper, Euler's formula and Handshaking lemma is used to obtain the face chromatic number of a planar graph by solving equations.
本文在前人研究的面着色问题基础上，运用欧拉公式和握手定理通过解方程组得到连通平面图的面色数。
Some upper bounds of the edge number for two class planar graphs are given. Some sufficient conditions for a planar graph to be class 1 are obtained through these bounds of edge number.
给出了平面图为第一类图的边数的一些上界，并给出了平面图为第一类图的一些充分条件。
By VRML, the users of the World Information Network can view spatial model, without being confined to planar graph, image.
通过VRML，全球信息网的使用者可以观赏到立体空间的模型，而不限于二维空间的图形、影像。
Because of the existence of it, the information conveyed by planar graph design is more scientific and more accurate and expression methods are more colorful.
也正是由于它的存在，使平面图形设计的信息传达更加科学准确，表现手法更加丰富多彩。
Because of the existence of it, the information conveyed by planar graph design is more scientific and more accurate and expression methods are more colorful.
也正是由于它的存在，使平面图形设计的信息传达更加科学准确，表现手法更加丰富多彩。
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