[多选题]同步发电机并网运行的首要条件是（ ）？(每题0.5分)（2.2）

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69426' and id < 4495756 and id<>'4495756' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69426' and id > 4495756 and id<>'4495756' order by id asc limit 5