基本解释[经济学]铜条式互换器英汉例句双语例句Basic formulas for the calculation of bar to bar voltage distributing curve of DC motor commutator are derived and test-verified.文中导出了计算直流电机换向器片间电压分布曲线的基本公式和试验验证；词组短语短语commutator -bar 整流条专业释义经济学铜条式互换器