220v380v的精选

两种焊机定义不同，没有好坏之分。&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp&nbsp三相电的三根线之间的电压是380伏，而相与中性线之间称为相电压，电压是220伏，还有两...