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题目:如图所示,电阻 R_1=5欧,R_3=20欧与 R_2组成一串联电路.当在电路两端加上电压 U 时,电
Title: As shown in the figure, resistor R_1 = 5 ohms, R_3 = 20 ohms and R_2 form a series circuit. When voltage U is applied across the circuit,