在上一期中，我们给您介绍了一个好的防护口罩所应具备的基本条件，但是面对各式各样的口罩，您也许还不知道，到底哪种最适合您的工作环境需要。本期我们就给您介绍一下口罩的分类，以及如何正确选择适当类型的口罩。口罩的分类方法有多种，通常我们按其结构与工作原理，... In the previous issue, we introduced you to the basics of a good respirator, but with a wide range of respirators, you may not know exactly what is right for your work environment. This issue we will introduce you to the classification of masks, and how to properly select the appropriate type of mask. There are a variety of methods of classification of masks, usually according to their structure and working principle, ...