Load distribution of axial fan along to the blade and blade height is put forward according to dynamic design method of quinticequation.
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。
2
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.