1.General kuiswa kwesimbi yakasununguka-inocheka simbi Yemahara yekucheka simbi, zvakare inoreva seyemahara-machining simbi, ndiyo alloy simbi nekuwedzerwa kweimwe kana kupfuura yakasununguka yekucheka zvinhu senge sulfur, phosphorus, lead, calcium, selenium uye tellurium ku. kunatsiridza midziyo yayo yekucheka.Simbi yemahara yekucheka ini...
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