“平常信函”的概念、定义、翻译、参考文献-科学参考

单词	平常信函
释义	平常信函 Encyclopedia 工学信函释 ordinary letter平常信函信函的一种常见形式。邮政企业在收寄时不出具收据，处理时不登记，投递时不要求收件人签收，不接受用户查询。简称平信。
随便看	elements of fold structures Elements of Geometry elements of geometry Elements of International Law Elements of Journalism elements of laws elements of light variation elements of mathematics elements of news Elements of Psychophysics elements of qigong practice elements of relative orientation elements of scene change Elements of Social Organization elements of textile design Elements of the Philosophy of Right element speciation elements portfolio innovation element stage element stiffness matrix element strain-displacement matrix element stress-displacement matrix element superconductor element supergene mobility element under rule of law for work safety and health

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。