【填空题】
77.DC600V供电客车塞拉门电伴热采用的空气开关为__________ 式。___
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【填空题】
115.TCDS由车载安全监控系统、车载无线传输装置、客列检WLAN联网设备，客车整备所、__________、铁路局、铁道部TCDS设备，应用以及各级中心的联网组成。___
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