Simbi yekucheka yemahara inoreva simbi yealloy iyo inowedzera imwe chiyero cheimwe kana kupfuura yakasununguka yekucheka zvinhu senge sulfur, phosphorus, lead, calcium, selenium, tellurium, nezvimwewo kuvandudza machinability yayo.Neyo otomatiki, kukurumidza-kumhanya uye iko kuchekwa kwekucheka, zvakakosha zvikuru kuda st ...
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