Amavaluvu Ovemvane: Ukukhetha Okuphelele Kokulawula Ukugeleza Okuphumelelayo Uma kuziwa ekulawuleni ukugeleza ezimbonini ezihlukahlukene, ukubaluleka kwamavalvu ovemvane angeke kwenqatshwe.Lawa ma-valve aguquguqukayo asetshenziswa ezinhlobonhlobo zezicelo ezisukela kuwoyela negesi, ukwelashwa kwamanzi, ukukhiqiza amandla...
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