Ngenxa yokuhanjiswa okuphezulu kwepulasitiki esobala, kunezidingo eziqinile ezisezingeni eliphezulu lemikhiqizo yepulasitiki, njengokungabi bikho kwamabala, awekho amaphethini, ama-porosity, amhlophe, imigqa enqenqemeni, amabala amnyama, ukushintsha kombala, ukucwebezela okungalingani, njll. umjovo wonke...
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