用一只磁电式电压表去测量某一非正弦电源电压，则该磁电式电压表的读数表示这个非正弦电源电压的为

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SQL Error: select id,body,options from ***_enewstiku where sourceid='32677' and id < 2599481 and id<>'2599481' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='32677' and id > 2599481 and id<>'2599481' order by id asc limit 5