“首日封”的概念、定义、翻译、参考文献-科学参考

单词	首日封
释义	首日封 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	equation with integral coefficients equation with one unknown equation without affect equation with several unknowns equation勒让德连带微分方程 equation玻尔兹曼积分微分方程 equator equator correction equator determination equatorial equatorial acceleration equatorial armillary sphere equatorial band equatorial bond equatorial buffer zone equatorial bulge equatorial circumference equatorial colure equatorial coordinate equatorial co-ordinates equatorial coordinate system equatorial counter current equatorial current equatorial diameter equatorial easterlies

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。