皮皮学，免费搜题
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搜题
【单选题】
• 、金属制成的圆形均匀截面导线的长为5m,其电阻为2Ω,现将该导线均匀拉长到10m,则此时的电阻变为( )Ω。A.
• A、2
B.
B、4
C.
C、6
D.
D、8
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