Makina owala akudya ndi ukadaulo wofunikira popanga zomwe sizimapanga - zida zodzitchinjiriza. Mwa njira iliyonse, kufunikira kwa zinthu zamankhwala - grass masks ndi n95 opuma mobwerezabwereza moyambira 2020 ndi koyambirira kwa covid - 19 Pandomu
Aluminiyamu - Zipangizo zophatikizira zophatikizika zimakhala ndi mawonekedwe a gawo "chifukwa zili ndi gawo la masamba (SIC, Al2o3, ndi zina). Mphamvu zakuthupi ndi mankhwala pakati pa gawo lothandizira ndipo matrix ndi osiyana kwambiri. Mavuto a