将一根导线均匀拉长为原长度的3倍，则阻值为原来的（   ）倍。

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SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id < 4499890 and id<>'4499890' order by id desc limit 5 SQL Error: select id,body,options from ***_enewstiku_ where sourceid='69471' and id > 4499890 and id<>'4499890' order by id asc limit 5