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施工现场临时用电安全技术规范（征求意见稿）
UDC中华人民共和国行业标准JGJPJGJ46-20××备案号J×一20×施工现场别临时用电安全技术规范Technical code for safety of temporary electrificationon construction site20××一××一××发...
奇异的生物发光世界
奇异而其妙的生物发光世界0:15So I want to take you on a trip to an alien world.And it's not a trip that requireslight-years of travel,but it's to a place where it's defined by light...