1. Kwiimibhobho ezineemfuno eziphezulu zokucheba, ngenxa yokusetyenziswa kwegesi engalinganiyo ngabasebenzisi, ukuguquguquka koxinzelelo lwemibhobho rhoqo, kunye noxinzelelo olutshintshileyo oluthwalwa yimibhobho yensimbi, iziphene ezikhoyo kwimibhobho ziya kwanda phantsi koxinzelelo olutshintshanayo.Imibhobho yentsimbi edityanisiweyo ene-Spiral ene-welds ezininzi kunye...
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