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25Hz相敏轨道电路参数在线监测系统.pdf_文档分享网

Web1、防护盒作用及故障后的影响：25HZ 相敏轨道电路继电器并接有防护盒， 防护盒对 50HZ 牵引电流相当于 15Ω的阻抗， 起到减小轨道线圈电压的作用， 对 25HZ 信号呈容抗， … http://www.youerw.com/yanjiu/lunwen_953.html mp3 players wireless headphones

国内外轨道电路现状及发展趋势_毕业论文 - youerw.com

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