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水土保持
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水土保持
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水土保持
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soil and water conservation
水土保持
防治水土流失,保护、改良与合理利用水土资源,维护和提高土地生产力,以利于充分发挥水土资源的生态效益、经济效益和社会效益,建立良好生态环境、保障经济社会可持续发展的综合性科学技术。
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derived geometric object
derived graph
derived group
derived ideal
derived language
derived length of a group
derived Lie algebra
derived Lie group
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derived polygon
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