供应商选择的步骤和评价方法研究。
水蚀风蚀交错区地下水资源计算与评价方法研究是一个薄弱环节。
The study on calculation and assessment of groundwater resources in water-wind erosion crisscross region has been the weak spot all along.
进行了地理信息系统(G I S)支持下的农用土地定量化、自动化评价方法研究。
GIS supported quantitative and automatic evaluation methods of agricultural land were presented.
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