Surface: Ra 6,3 这如何理解
在加拿大 Material: AlSi1MgMn (3.2315 anticorodal-112 T6, local standard is allowed, if equivalent in composition and in characteristics; all delivered articles have to comply with the EC-regulation 2002/95, ROHS). Surface: Ra 6,3 以上应该怎么理解...华人论坛