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【单选题】
按下列哪一条原则，电力负荷分为一级负荷、二级负荷和三级负荷?A.
按建筑物电力负荷的大小进行分级
B.
按建筑物的高度和总建筑面积进行分级
C.
根据建筑物的使用性质进行分级
D.
根据对供电可靠性的要求及中断供电在政治、经济上所造成损失或影响的程度进行分级
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