某导体接在电路中如果把加在该导体两端电压减�到原来的一半保持温度不变则导体的电阻和通过它的电流 A.都减小到原来的一半 B.都保持 Template


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tomski某导体接在电路中如果把加在该导体两端电压减�到原来的一半保持温度不变则导体的电阻和通过它的电流 a.都减小到原来的一半 b.都保持 coloring