“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	number of double points number of effective plates number of effective sperms number of eggs laid number of external stability number of faces number of figures number of floating point operations number of floating-point operations number of generators number of handles number of hydration number of inbound tourists number of independence number of internal stability number of inversions number of local moduli number of monofilaments number of outbound number of outbound tourists number of participants number of partitions number of permutations number of person-days number of places

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。