近期人们为了自身安全,逐渐接受在公共场合戴口罩或面罩。那么哪种材质的布口罩过滤效果最佳?最新研究表明,棉丝及棉绒等混合织物做成的口罩最好。 在各国公共卫生官
Latest 50 Articles with tag: 织物过滤
Latest Covid19 Info
- Ontario New Case+2,632
- Ontario New Death+46
- Canada First doses658,662
- Canada Second doses53,629
- Canada % of population vaccinated1.87%
- Canada Received from manufacturer893,240
- Canada Received doses administered79.7%