如果某发电厂装有四台机组，正常运行时四台机组都没有达到额定出力，且有.，当发电厂有功负荷增大时，应首先增加出力的发电机组是(    )。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69460' and id < 4498457 and id<>'4498457' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69460' and id > 4498457 and id<>'4498457' order by id asc limit 5