实物资本维护概念 physical capital maintenance concept
货币资本维护概念 money capital maintenance concept
环境保护概论 Introduction to Environmental Protection ; general environment protection theory
财务资本维护概念 financial capital maintenance concept
防护概念 CMCKG-PP
野生动物保护概论 Chapterl
滴灌保护概念 Drip protection concept
购买力资本维护概念 purchasing power capital maintenance concept
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