1, Ukuqwalasela ukusetyenziswa kokusingqongileyo kunye nokufezekisa umphumo.Ungcoliseko lomoya jikelele lwangaphakathi 1) uthuli, intsholongwane, ibhaktheriya, ukungunda kunye namangolwane kunye nezinye izifo;(2) iigesi eziphilayo eziguquguqukayo, ezifana ne-formaldehyde, benzene, ammonia, njl.;(3) Ungcoliseko lwe-radioactive olubangelwa yirhasi yeradon kunye nentombi yayo...
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