“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	medium and long-term planning of water supply and demand Medium-and Long-term Youth Development Plan(2016—2025) medium and low-rise with high density medium-and-low-yield farmland rehabilitation medium-band photometry medium-band width medium bosons Medium calorific value gas medium carbon steel medium coat medium contrast medium cotton medium crude oil medium density fiberboard medium dispersion medium earth orbit medium earth orbit, MEO medium effect medium effects medium energy electron diffraction medium energy electron diffraction, MEED medium engineering medium focal length lens medium format camera medium frequency

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。