装有三段式电流保护的线路，当线路末端短路时，一般由（  ）动作切除故障。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id < 4500162 and id<>'4500162' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69477' and id > 4500162 and id<>'4500162' order by id asc limit 5