ASME B30.6-2020 Derricks

zubair267 发表于 2021-4-24 17:44:30

ASME B30.6-2020 Derricks Safety Standard for Cableways, Cranes, Derricks, Hoists, Hooks, Jacks, and Slings

myyeh 发表于 2021-4-28 18:34:51

謝謝分享----------------------

admin 发表于 2021-5-20 15:05:59

谢谢您的分享，金币已奖励！

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