Some important artifacts recently unearthed fromthe Dawenkou cultural site of Dadunzai in Pizhou,Jiangsu inclilding a stone bi with engraved sun and bird and a carved bone bird with engraved sun and bird provide the archaeological evidence for the theory of sun-worship and bird totem in dongyi tribes.

The paper has researched module comparability theories about regular rings,including the module of regular rings and characterizations about modules over strongly regular rings.

This paper is made of two parts:one part is the tychonoff infinite productproperties ofσ-ortho compact;In the other part,we introduce the notion ofbase-countably paracompact, and research its properties and equivalentcharacterization theorems.

Firstly, the mural painting of flowers and birds in this tomb is in a symmetric pattern.

The flower-and-bird painting is the traditional Chinese painting important component,has the glorious history,presents the different style form along with time vicissitude each generation,the picture performance different form esthetic sense,the picture form feeling including intrinsic energetic and the external form.

Xu Wei is an outstanding master of flower-and-bird painting in late Ming Dynasty.

With some reference from other works, this article analyzes the features of Wang Yuan s flower-and-bird painting and draws the following conclusion:1.