“philatelic products”的概念、定义、翻译、参考文献-科学参考

单词	philatelic products
释义	philatelic products Encyclopedia 工学集邮品释 philatelic products集邮品供集邮者收藏的邮资凭证和各类集邮制品、邮政用品及与集邮活动有关的收藏品的总称。
随便看	metric relation metric result metric scheme metric segment metric space metric standard equation metric straight line metric structure metric subspace metric system metric tensor metric tensor density metric theory metric theory of functions metric theory of numbers metric topology metric transfer metric transitivity metric type metric vector space metric wave metric-wave metric with symmetry metrizability metrizability criterion

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