Ndi chitukuko cha chuma ndi anthu, kuti akwaniritse zosowa zosiyanasiyana, kotero mafakitale kapena minda monga CDC, kuyesa chakudya, makampani mankhwala, mabungwe kafukufuku sayansi, chilengedwe chitetezo zachilengedwe, kachitidwe madzi, kachitidwe petrochemical, kachitidwe magetsi, etc. ...
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