采用90°接线的功率方向元件在（  ）情况下不能动作。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id < 4500185 and id<>'4500185' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id > 4500185 and id<>'4500185' order by id asc limit 5