Load distribution of axial fan along to the blade and blade height is put forward according to dynamic design method of quintic equation.

提出了轴流通风机沿叶片叶高的载荷分布，按五次方流型设计的方法。

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In the fifth section, we obtain some sufficient conditions under which a class of a planar quintic system has at most two limit cycles by transforming it into Abel equation.

第五章讨论了一类可化为abel方程的五次多项式系统的极限环的个数，得到此类平面五次多项式系统至多存在两个极限环的充分条件。

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