阶段式电流保护的时限级差的大小取决于（   ）。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id < 4491170 and id<>'4491170' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69376' and id > 4491170 and id<>'4491170' order by id asc limit 5