如图所示为某种电子秤的原理示意图ab为一均匀的�线变阻器阻值为r长度为l两边分别有p1p2两个�动头与p1相连的�属细杆可在被固定 Template




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tomski如图所示为某种电子秤的原理示意图ab为一均匀的�线变阻器阻值为r长度为l两边分别有p1p2两个�动头与p1相连的�属细杆可在被固定 coloring