220kV输电线单相跳闸熄弧慢是由（   ）决定的。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69379' and id < 4491586 and id<>'4491586' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69379' and id > 4491586 and id<>'4491586' order by id asc limit 5