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一、派生不力,难寻蹊径题1(南京市中考题)如图1电路中,电源电压不变,开关 S 闭合后,滑动变阻器的滑片
First, it is difficult to find a difficult, difficult to find problem 1 (Nanjing examination questions) In the circuit of Figure 1, the power supply voltage is unchanged, after the switch S is closed, the slide of the sliding rheostat