Vavu ndi gawo lowongolera pamapaipi oyendera, omwe angagwiritsidwe ntchito kuwongolera kayendedwe ka mpweya, madzi, nthunzi, zotengera zosiyanasiyana zowononga, matope, mafuta, zitsulo zamadzimadzi ndi ma radio radioactive media.M'makampani opanga mankhwala, kugwiritsa ntchito ma valve akuluakulu.Mwachitsanzo, mu pharmaceutical indus ...
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