The results of the research can be classified as follow: Firstly, the early debate mainly concentrated in the question that if Yu was a truly person or a god.

综合百年来大禹传说的研究成果，有以下几方面特点：其一，早期的争论主要集中在大禹是神话人物还是历史人物方面；

youdao

The common fault of asynchronous motor can be classified as stator fault, rotor fault as well as bearing fault mainly.

异步电动机的常见故障主要可以分为定子故障、转子故障及轴承故障。

youdao

The factors influencing agglomeration economy can be mainly classified into such two categories as transportation cost and production density.

影响集聚经济的因素主要可归为运输成本和生产密度这两大类。

youdao