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小于20km基线的快速准确相对定位可用双频GPS接收机完成.使用不同的水准测量技术,通过测量出若干GPS站点的正高,可模拟出大地水准......
种植在农地上的旱冬瓜能促进农作物生长,据测定1t旱冬瓜树叶干物质量的肥力相当于14.3kg硫酸铵、2.4kg过磷酸钙和2.2kg硫酸钾,农户......
State and Development: Changes in Livelihood Strategies in Garhwal with Special Reference to Ecotour
The object of the paper is to provide an insight into the changes in livelihood strategies of the people in the Garhwal ......