电力系统中一级负荷、二级负荷和三级负荷的划分依据是用户对供电的(    )

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id < 4421475 and id<>'4421475' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='68479' and id > 4421475 and id<>'4421475' order by id asc limit 5