同步发电机并网运行后，只有当功率角δ>90°时，才能在受到小干扰后重新稳定。（   ）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69400' and id < 4493255 and id<>'4493255' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69400' and id > 4493255 and id<>'4493255' order by id asc limit 5