电力系统中重要的电压支撑节点称为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='29461' and id < 2399502 and id<>'2399502' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='29461' and id > 2399502 and id<>'2399502' order by id asc limit 5