以电压U和(U-IZ)比较相位，可构成（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69377' and id < 4491321 and id<>'4491321' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69377' and id > 4491321 and id<>'4491321' order by id asc limit 5