Posachedwapa, kasitomala wina adauza kuti apeza ogulitsa ena amawatchula pamtengo wotsika kwambiri wa Carbon/Graphite Raschig Ring, nthawi zina amakopeka ndi katundu wawo wotsika mtengo, mwina chifukwa sakudziwa bwino za katunduyu, ndi zina.Tonse tikudziwa, zikuwoneka mtengo wotsika mtengo kwambiri, koma katundu wawo khalidwe ...
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