Ivalve ekhethekileyo yeoli kunye negesi
Ukuze ulawule ukuhamba kweoli kunye negesi, i-oyile ekhethekileyo kunye ne-valve yegesi kufuneka ibe nezi zinto zilandelayo: ukutywinwa, amandla oxinzelelo, ukhuseleko, ukulungiswa, ukuhamba kwamanzi kunye nokuguquguquka kokutshintsha. Kuxinzelelo oluphezulu, olunokutsha kunye neoli eqhumayo kunye negesi medium, th...
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