Dalilai daban-daban da suka shafi yanayin juzu'i 1. Abubuwan da ke cikin ƙasa Saboda gurɓataccen gurɓataccen yanayi, maganin zafi na sinadarai, electroplating da lubricants, da dai sauransu, fim ɗin saman bakin ciki sosai (kamar fim ɗin oxide, fim ɗin sulfide, fim ɗin phosphide, fim ɗin chloride, fim ɗin indium, fim ɗin cadmium. , aluminum film, da dai sauransu) shi ne don ...
Kara karantawa