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ASTM A 106 Black Carbon Seamless Simbi Machubhu emhando dzakasiyana dzekupisa tembiricha sevhisi yekushandisa
KuBotop, tine rukudzo rwekuva bazi repasi rose reHebei allland Steel Tube Group, uye tinochengeterawo machubhu akasiyana-siyana esimbi asina musono kusangana nezvinodiwa nevatengi....Verenga zvimwe