If we looked at the Wang s academic road,we found that the method "double proofs"which had influenced 20 century academy was established in the year 1914,when he and Luo Zhen yu exemined and corrected the Han Jin bamboo and wrote Liu sha zhui jian,The general trend of 21th century history study is to combine the mordern archaeology and historical documents, whi.

The text studied on processing techn ology of persimmon pendant,the qual ity was improved.

Application of very-short-distance overwind buffer and falling prevention system;