YZ邮政标准

YY 9706.257-2021.Medical electrical equipment- Part 2-57 : Particular requirements for the basic safety and essential performance of non-laser light source equipment intended for th...

标准号：YZ/T 0140-2015标准名称：邮件和快件投递状态分类与代码英文名称：Specifications for classification and coding of delivery statuses of mail and expre...