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随便看	square wave polarography square-wave polarography Square-wave Power Supply Motor Research square wave pulse square-wave pulse square wave pulse current square-wave pulse of light square wave PWM square waver square wave response square-wave response square wave response characteristic square-wave response characteristic square wave response curve square wave response function square-wave ringer square waves Square waves square-waves square waves generators square wave signal square-wave signal square-wave signal generator square-wave signal source Square waves,like sine waves,are periodic