Kodi pulasitala amagwiritsa ntchito chiyani, ndipo n'chifukwa chiyani ndi yofunika? Pulasita ndi zida zomangira zosunthika zomwe zakhala zikugwiritsidwa ntchito kwazaka zambiri pomanga ndi kukongoletsa ntchito. Zimapangidwa ndi gypsum, laimu, mchenga, ndi madzi, zomwe zimagwiritsidwa ntchito ngati phala pamakoma, kudenga, ndi malo ena. ...
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