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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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On site operation method
onsite purchasing
onsite quality control
on-site sampling technique
on-site situation assessment
on-site survey of Chinese materia medica resources
onsite technical service for concentrators
On socialist commodity economy
on-spot monitoring
On State Governance
On Style
Ontario Province
Ontario School Question
Ontario Workmen’s Compensation Act
On the 16th Night Stepping on the Lamp, Drinking with Qu Zhongyu and Wang Xinfu in the West Building of the Dazhong Bridge
On the Archival Science in contemporary China
On the Art of Building in Ten Books
On the Art of Poetry
On the Art of Suzhou Pingtan
On the Body
On the Citizen
On the Commonwealth
On the Correct Handling of Contradictions among the People
On the Creation of Popular Science Films
On the Cultivation of Communist Party Members
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