“ordinary letter”的概念、定义、翻译、参考文献-科学参考

单词	ordinary letter
释义	ordinary letter 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	negative index of inertia negative infinity negative inotropic action negative integer negative ion negative ion mass spectrum negative ion mode negative jump negative K group of a ring negative K-group of a ring negative K-theory negative kurtosis negative leap second negative lens negative life event Negative likelihood ratio negative likelihood ratio negative limit point negative limit set negative list approach to foreign investment administration negative list management negative logic negatively definite negatively definite form negatively definite kernel

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。