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nationa leveling network
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nationa leveling network
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高程控制网
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nationa leveling network
国家水准网
在全国领土范围内,由一系列按国家统一规范布设和测定高程的水准点所构成的网。为国家经济建设、国防建设和科学研究提供地面点高程,也为天文大地网、地形图测制提供高程控制。又称国家高程控制网。
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ancient and famous tree
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ancient and famous trees in Shandong Province
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ancient Arab states
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ancient ballads and proverbs
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