鉴别简易防尘口罩性能的简便方法目前，市场上简易防尘口罩种类很多，其中有不少假冒劣质产品。怎样识别其真伪呢？主要从外观质量和性能质量去鉴定。外观质量可用肉眼观察、用手触摸检查。主要看颜色与缝线的均匀性、滤料有无缺损、零部件是否完整牢固、同脸面接触部位是... Simple way to identify the performance of simple dust masks At present, the market a lot of simple types of dust masks, including many fake and inferior products. How to identify its authenticity? Mainly from the appearance of quality and performance to identify quality. Appearance quality can be observed with the naked eye, touch check by hand. Mainly to see the color and stitch uniformity, filter defect, the parts are intact, the contact area with the face is ...