With respect to the advantages for both countries and to the effects of their co-operation, this article discusses the basic content of advantage obtainment theory , and in view of this theory, proposes a strategy for Chinese foreign-orientation investment.

Barrier of Availability and Accessibility to Essential Drugs;

Based on the six representative samples in the library science and information science,the paper draws 300 web citations randomly and explores their availability from three different aspects——availability,language,original web site.