Based on Arrow s theory of selection(filter device) about the higher education level,this article analyzes the phenomenon of "engage PHD as officeholder" from the economic perspective.

The title of Ch inqu geci(琴曲歌辞)in the collection of Yuefu Poetry mostly has music meaning,such as“Cao(操)”、“Yin (引)”、“Nong(弄)”etc.

Ancient themes in lyrics of Guqin songs such as "Cao","Yin","Nong",and "Chang" took on the characteristics of apparent taxonomical changes in terms of such aspects as literature features,musical styles.

The use frequency of the character yin appears very low in common speech and only appears as morpheme in the words.

Through methane simulation experiment on ignition and blasting due to seam roof rock friction in Qinshui Coal Mining District of Yangcheng, it is shown that sparks will be generated through friction while caving ,causing gas and water mixture to fire, it is big hidden sources which cause methane blasting accident in goaf.

Review of studies on relation between channel silting and water diversion of the Lower Yellow River;

Scientific Citation Index and Evaluation of Scientific Achievements;

Approaches of Achieving Citation Index s Function on the Searching Flowchart of Web of Science;

The Development, Functions and Significance of Chinese Social Sciences Citation Index;