Ithreyi lekhebula lihlukaniswe ngethreyi yekhebula lensimbi (ithreyi yekhebula elakhanyiswa ngaphambili, ithreyi lekhebula elinothayela, ithreyi yekhebula elidiphu elishisayo, ithreyi yekhebula ehlanganiswe ngophuphu, ithreyi lekhebula lensimbi engagqwali, ithreyi yentambo enezikhala noma ithreyi yekhebula likabhasikidi.), Ithreyi yekhebula lePolymer, FRP noma ithreyi lekhebula le-GRP adn pvc trunking.Ungafaka kanjani...
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