Many research works on layout problem in many fields are made. However, it is weak to apply layout theory in the aspect of mechanical project field.
尽管人们对布局问题已进行了较为深入地研究，在许多领域中也取得一些进展，然而布局设计问题在机械工程领域方面的研究还比较薄弱。
The past research is mostly to Tong Zhi the whole huge works and a certain aspect, this text point lies in summary Zheng Qiao's position and influence in our history.
前人的研究多是对《通志》整本巨著或者对其中某个方面的研究，本文重点在于归纳总结郑樵在我国历史上的地位及影响。
The past research is mostly to Tong Zhi the whole huge works and a certain aspect, this text point lies in summary Zheng Qiao's position and influence in our history.
前人的研究多是对《通志》整本巨著或者对其中某个方面的研究，本文重点在于归纳总结郑樵在我国历史上的地位及影响。
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