“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	risk of an estimator risk of a statistical procedure risk of environmental geological problems risk of forest fire risk of maritime traffic risk of prairie fire risk of reaction risk of space radiation risk of the first kind risk of the second kind risk of the third kind risk on hazards of exotic species risk perception risk perception in the commission of crime risk point risk predictability training risk prediction risk preference risk premium risk prevention of collection risk priority number risk profile risk rerception risk retention risk return tradeoff

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。