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Issue:When printing to DWG to PDF.pc3 quality of print is poor. Also, background mask shows unexpected results. Top 10 best Medical Face Masks protection 2021 - Best List It helps in the practitioners from catching bacteria during surgery or nursing. Besides, some people use these masks to prevent themselves from the possibility of catching or spreading airborne diseases that come as a result of pollution. Meant for severe such use, medical masks must, therefore, be of quite some good quality.Best and worst masks for coronavirus, from surgical masks The science is clear:Face masks can prevent coronavirus transmission and save lives.. A preliminary analysis of 194 countries found that places where masks weren't recommended saw a 55% weekly