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【简答题】
从下表中选出适当的实验器材,测量小灯泡的伏安特性曲线,得到如图的I-U图线, (1)在如图所示的IU图线中,A到B过程中灯泡电阻改变了________Ω. (2)测量电路中电流表用________(填代号),电压表用________(填代号),电流表应采用________(填内、外)接法. (3)在图示虚线框中用笔补画完整实验电路图,要求变阻器滑动片右移时,灯泡两端电压变大.
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