电力系统的热备用是指系统中可运行机组的可发有功功率和系统所消耗的有功功率的差值。（    ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69457' and id < 4498180 and id<>'4498180' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69457' and id > 4498180 and id<>'4498180' order by id asc limit 5