第三章研究二阶流体运动的控制方程和平均欧拉方程。

In the third chapter, we consider the equations governing the motion of second grade fluid and averaged equations.

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主要考虑外平面图，系列平行图和平面欧拉图这三类特殊的平面图。

In this paper we prove that the problem is polynomial solvable on several special classes of graphs, such as outerplanar graphs, series-parallel graphs and Eulerian planar graphs.

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