3.如图所示的电路中电源电动势为e内阻r不能忽略.r1和r2是两个定值电阻l是一个自感系数较大的线圈.开关s原来是断开的.从闭合开关s到 Template




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tomski3.如图所示的电路中电源电动势为e内阻r不能忽略.r1和r2是两个定值电阻l是一个自感系数较大的线圈.开关s原来是断开的.从闭合开关s到 coloring