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含有一个氧杂原子的五元 杂环化合物,分子式C4H4O。
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national primary pressure standard
national primary scale topographic maps
national primary standard for acidity (pH)
national primary standard for combustion heat
national primary standard for electrolytic conductivity
national primary standard for humidity
national primary standard for primary chemical purity
national primary standard for viscosity
national primary standard of measurement
National Professional Standards for Sports Broker
National Program for Acquisitions and Cataloging
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
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