Research on Classification by Appearance of Larch Timber and Vibration Inspection Tests contingent survey 落叶松锯材外观分等与振动检测试验的研究临时检查临时检验意外检验
Measuring the economic value of restoring ecosystem services in Zhangye city of Heihe river basin& Comparison and application of continuous and discrete contingent valuation survey 黑河流域张掖市生态系统服务恢复价值评估研究&连续型和离散型条件价值评估方法的比较应用
The Application of Information Entropy on the Sample Amount and Content in Contingent Valuation Survey 运用信息熵理论研究条件估值调查中的抽样问题