Sitima yapamtunda ndi chinthu chofunikira chomwe chimagwiritsidwa ntchito poyendetsa njanji, ndipo mitundu yake ndi ntchito zake ndizosiyanasiyana. Mitundu yodziwika bwino ya njanji ndi 45kg/m, 50kg/m, 60kg/m ndi 75kg/m. Mitundu yosiyanasiyana ya njanji ndi suitab ...
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