“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	single frequency network single-frequency positioning single-frequency sounder single-gene disorder, monogenic disorder single gimbal control moment gyro single group design single head type of organization single-heterolaser single heterostructure single-hole charge single-hole sonic logging meter single-hook winding single-hump mapping single-image photogrammetry single inclusion problem single index element single-index model single index regression model single-index regression model single inheritance single-injection pressurization single in-line memory module single in-line memory module, SIMM single in-line package single in-line package, SIP

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。