Cov lus piav qhia Aluminium coiled tube piav qhia sab hauv-grooved aluminium alloy raj (Alloy qib: 3003 lossis 3103, thiab lwm yam.) Aluminium coiled raj piav qhia Aluminium ingots yog extruded, kos, puab grooved los ua rau hauv cov raj.aluminium raj muaj ductility zoo, thiab sab hauv helical fin qhov siab ntawm 0....
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