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试验单元在相对齐性单元内的一种安排,使每个区组内的试验误差小于处理随机安排在数目相近的试验单元时的试验误差。
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National Program for Agricultual Development,1956-1967 (Draft)
National Programme for Protection of Wild Fauna and Flora and Development of Nature Reserves
National Programme of China on Gradual Elimination Ozone Layer-Depleting Substances
National Progressive Unionist Grouping Party
National Project of Coastal Environment Investigation and Assessment,908 Project
National Protection War
national prototype of the kilogram
national prototype of the kilogram for checking
National Provincial Museum Director Professional Management Cadres Training Class
national public relations
National Public Security Commission
National Public Security Organs Cross-regional Case Handling Cooperation Platform
National Public Security Work Conference in the New Era
National Publishing Committee
National Radio and Television Administration
national radio and television editor and reporter, announcer and host qualification examination
National Radio Astronomy Observatory
National Radio,Film and television Academic Paper Award
National Radio, Film and Television Academic Works Award
National Railway Administration of The People's Republic of China
National Railway Museum
National Rainbow Coalition
National Rally of Independents
national reading rate
National Reconciliation Week
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