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1. Square waves, like sine waves, are periodic.
   方波如正弦波一样是周期性的。
2. In the square wave current welding,the inductance is very important to influence the fomation of square wave A.
   在方波交流焊中，电抗器的电感量对方波的形成及电弧的稳定性有着很大的影响。