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下图为一只三量程的直流电流表的电路。已知表头满偏电流I_s=100μA,内阻R_i=1KΩ;三个量程的电流分别为:50mA,1mA和250μA。试计算电阻R_1、R_2和R_3之值。
The following figure shows a three-range DC ammeter circuit. It is known that the full scale partial current I_s = 100μA and the internal resistance R_i = 1KΩ. The three ranges of current are 50mA, 1mA and 250μA respectively. Calculate the value of resistors R_1, R_2 and R_3.