• <bdo id="k4sym"><bdo id="k4sym"></bdo></bdo>
  • <bdo id="k4sym"></bdo>
  • <nav id="k4sym"><input id="k4sym"></input></nav>
  • <blockquote id="k4sym"><samp id="k4sym"></samp></blockquote>
  • <blockquote id="k4sym"></blockquote>
  • 五源科技

    Classic case
    Aluminum alloy industry

    As one of the drafters of the industry standard YS / t1189-2017 chromium free chemical pretreatment film for aluminum and aluminum alloys,

    zhejiang pentatomic science&technology inc.

    has a profound and tested surface treatment technology in the aluminum alloy industry.

    乌克兰美女高潮呻吟_中国妇女毛茸茸黑乎乎_五月丁香啪啪_高潮痉挛videos ?