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日前,国家机关事务管理局联合国家发展改革委等多部门发布《公共机构碳排放核算指南》。并于4月1日正式实施。该标准以公共机构能源资源消费统计为依据,兼顾地域差异与能源发展趋势,为公共机
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led是一种电致发光器件,电流与器件出光有直接的关系,该文讨论了在不同电流下,功率型白光led发光的色温、光通量、色坐标等光学参数的变化,并分别得到相应的结论。
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