“曹冲称象”的故事流传至今，最为人称道的是曹冲采用的方法，他把船上的大象换成成石头，而其他条件保持 “曹冲称象”的故事流传至今，最为人称道的是曹冲采用的方法，他...
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（2）具体实验过程为：先只闭合开关S2，记下此时的电流表示数I，此时只有待测电阻接入电路；再把S2断开，闭合S1，此时只有电阻箱接入电路，调节电阻箱电阻，使电流表示数也为I，记下此时电阻箱的阻值R．此时“等效”了，故待测电阻阻值与电阻箱阻值相等，即Rx=R．
故本题答案为：
（1）如图：
（2）②只闭合开关S2，记下此时的电流表示数I
③把S2断开，闭合S1，调节电阻箱的电阻，使电流表示数也为I，记下此时电阻箱的阻值R
（3）R．
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