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【多选题】
关于变压器效率，描述正确的是( )。A.
当铁损大于铜损时变压器处于最经济运行状态
B.
变压器的效率为输出的有功功率与输入的有功功率之比的百分数
C.
变压器的损耗包括铁损和铜损
D.
当铁损和铜损相等时变压器处于最经济运行状态
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