Kunena zowona, zomwe timachita ndikuchepetsa phokoso, chifukwa ziribe kanthu zomwe tingachite, sitingathe kulekanitsa phokoso, koma tikhoza kuchepetsa phokoso momwe tingathere, makamaka pogwiritsa ntchito njira zitatu: kutsekemera kwadzidzidzi, kutsekemera kwa mawu, ndi kutsekemera kwa phokoso, ndi kuyamwa kwamawu.Zida ndizo makamaka 1. Butyl ru ...
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