将一根导线均匀拉长为原长的2倍，则它的阻值为原阻值的（）倍。

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SQL Error: select id,body,options from ***_enewstiku where sourceid='27226' and id < 2260003 and id<>'2260003' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku where sourceid='27226' and id > 2260003 and id<>'2260003' order by id asc limit 5