mapaipi PVC chimagwiritsidwa ntchito ngalande, madzi oipa, mankhwala, Kutentha zakumwa ndi coolants, zakudya, kopitilira muyeso-woyera zamadzimadzi, matope, mpweya, wothinikizidwa mpweya ndi vacuum chifukwa cha kulemera kwawo, kukana dzimbiri, mkulu compressive mphamvu, chitetezo ndi mayiko.dongosolo.Adayamikiridwa ndi injiniya ...
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