mm 的铜芯导线，允许通过的长期最大电流为（ ）。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='30395' and id < 2457154 and id<>'2457154' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='30395' and id > 2457154 and id<>'2457154' order by id asc limit 5