“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	safety interlock safety in the petroleum and petrochemical industry safety inventory safety investment benefit evaluation safety investment decision-making techniques safety issue of nuclear power safety knowledge safety landfilling of fly ash safety leadership challenge safety level of railway signaling safety maintenance technology of well control equipment safety management safety management and inspection requirements of pressure pipeline safety management axiom safety management diagnosis safety management during construction Safety Management Measures in Primary School, Secondary School and Kindergarten safety management method safety management methodology safety management mode safety management of blasting materials safety management of construction project safety management of crane equipment safety management of exploration blasting operation safety management of gas station

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。