A fagen hako mai da rijiyar mai, babban juriya na lantarki mai juriya mai walƙiya (wanda ake magana da shi azaman ERW casing) idan aka kwatanta da casing maras kyau yana da daidaito mai girma, ƙarfin walƙiya, anti-extrusion na babban aiki, da fa'idodin ƙarancin farashi, wanda An yi amfani da shi sosai a cikin haɗin gwiwar waje ...
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