概述了国内外长期肥料试验研究的主要成果。
The main production of long - term fertilizer test in the world were uttered.
回顾了几十年来非饱和土有效应力研究的主要成果。
The main research results of effective stress principle of unsaturated soil several decades are reviewed.
本文研究的主要成果是水利工程3D GIS数据模型与数据结构。
The production of this paper is what is targeted initially: 3D GIS data model and data structure of water conservancy.
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