Chitoliro cha Spiral (SSAW) ndi chitoliro cha chitsulo chozungulira cha kaboni chopangidwa ndi koyilo yachitsulo ngati zopangira, zomwe nthawi zambiri zimatuluka mwachikondi, komanso zowotcherera ndi waya wowirikiza mbali ziwiri zowotcherera arc. Amagwiritsidwa ntchito makamaka mu engineering ya madzi, petrochemical, chemical, magetsi, agricultur ...
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