“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	affine isomorphism affine isoperimetric inequality affine isothermal net affine Kac Moody algebra affine Kac-Moody algebra affine length affine Lie algebra affine Lie algebra embedding affine line affine linear space affinely congruent affinely congruent figures affinely congruent triangles affinely connected affinely connected manifold affinely connected space affinely dependent affinely dependent set affinely extended real numbers affinely independent affinely independent set affine manifold affine mapping affine matrix affine mean curvature

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。