选择题:大惯量直流电机与普通直流电机相比,其性能参数的特点是……………………( )①电机的扭矩M大,转动惯量

题目内容:
大惯量直流电机与普通直流电机相比,其性能参数的特点是……………………( )
①电机的扭矩M大,转动惯量J小 ②M小,J大
③M,J大,M/J小 ④M,J大,M/J也大
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