-
韩国KF系列口罩标准解读 世界上不同国家和地区对不同的产品都会有不同的要求,口罩也不例外,各个国家和地区的标准都会对不同口罩进行各项指标数据划分标准。欧洲有FFP1/2/3,北美有N90/95/99,BFE/PFE/VFE等,我国有GB2626、GB32
-
As we all know,toilet is a dispensable facility in our life, because there is
-
Nonwoven fabrics are broadly defined as sheet or web structures bonded together by entangling fiber or filaments (and by perforating films) mechanical