ut30b的精选

方法如下(1)旋转波段开关，至交流电压500V档（V~500）&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp(2)黑表笔插入“COM”插孔，红表笔插入“VΩmA”插孔&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp(3)手持表...