Black Friday: lifetime access is on a special offer in the app, until November 30. Black Friday: special offer on lifetime access, until November 30. Download
여과성은 물리적 필터의 효율성을 결정하는 중요한 요소입니다.Yeogwaseongeun mulrijeok pilteoui hyoyulseong-eul gyeoljeonghaneun jungyohan yosoimnida.Filterability is an important factor that determines the efficiency of physical filters.