Publisher： 国家哲学社会科学学术期刊数据库

E-ISSN： 1007-6875|40|3|39-43

ISSN： 1007-6875

Source： 河北地质大学学报, Vol.40, Iss.3, 2017-01, pp. : 39-43

Disclaimer: Any content in publications that violate the sovereignty, the constitution or regulations of the PRC is not accepted or approved by CNPIEC.

Previous Menu Next