“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	space grating device space gravitational physiology Space Ground Station space group space group extinction space-group maximum space harmonic space harmonics Space headway space heavy ion space height of boiler steam space hierarchy theorem space human factors engineering space human-rating evaluation space human reliability space hypoxia tolerance space in duality space industry Space Industry Standardization Technical Committee Space Infrared Telescope Facility Space Infrared Telescope for Cosmology and Astrophysics space instrumentation space insurance space integral space intelligence

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。