Publisher： 国家哲学社会科学学术期刊数据库

E-ISSN： 1008-6927|volume|4|24-27

ISSN： 1008-6927

Source： 河北农业大学学报：农林教育版, Vol.volume, Iss.4, 2015-01, pp. : 24-27

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