This paper analyzes the substituting effect of forest certification against tariff barriers using a space-price gradient model, and gives Suggestions.
本文利用空间价格梯度场模型分析了森林认证对关税壁垒的替代效应，并在最后提出了相关建议。
The company has international and domestic invention and utility model patent number, and through ISO9001 international quality management certification.
公司拥有国际国内发明和实用新型专利多项，并通过ISO 9001国际质量管理认证。
It provides a new valuable way of the construction of the national-level PKI secure certification model in the open networks.
这为构建国家级PK I安全认证模型的研究提供了一个有价值的新思路。
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