汽轮发电机在稳定运行时，功角的取值范围是（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69508' and id < 4502890 and id<>'4502890' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69508' and id > 4502890 and id<>'4502890' order by id asc limit 5