变压器差动保护的差动元件通常采用比率制动特性，引人外部(   )作为制动量。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69519' and id < 4503778 and id<>'4503778' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69519' and id > 4503778 and id<>'4503778' order by id asc limit 5