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I-ASTM A 106 Black Carbon Seamless Steel Tubes yezinhlelo zokusebenza ezihlukahlukene zesevisi yokushisa okuphezulu
Kwa-Botop, sihlonishwa ngokuba igatsha lamazwe ngamazwe le-Hebei allland Steel Tube Group, futhi sigcina inhlobonhlobo yamashubhu ensimbi angenamthungo ukuze sihlangabezane nezidingo zamakhasimende....Funda kabanzi