“first day cover”的概念、定义、翻译、参考文献-科学参考

单词	first day cover
释义	first day cover Encyclopedia 工学集邮品释 first day cover首日封在新邮票发行首日，将该套邮票的全套或单枚贴在特制信封、普通信封或纪念信封的右上角，加盖当日邮政日戳或特制的首日纪念邮戳的信封。
随便看	absolute curvature absolute curvature vector absolute cycle absolute dating of document absolute degree absolute deprivation absolute derivative absolute detection efficiency absolute determination absolute determination ofelectrical units absolute deviation absolute different absolute differential absolute differential calculus absolute differentiation absolute dimension absolute discriminant absolute dispersion absolute distance absolute distribution absolute dosimeter absolute efficiency absolute electromagnetic system of units absolute electro-magnetic unit absolute electrophoretic mobility

科学参考收录了854744条科技类词条，基本涵盖了常见科技类参考文献及英语词汇的翻译，是科学学习和研究的有利工具。