What we notice in these different batches is a progression to higher and higher levels of specification,including,in the latest batch,an anodized coating on extremely smooth inner and outer surfaces.

 
  • 我们发现这些铝管的级别规格越来越高,在最近的一批货物中,其经过阳极电镀处理,铝管内外表面都非常光滑。
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