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地铁扫码进闸为什么要开启蓝牙（坐标长沙）
source link: https://www.v2ex.com/t/576207
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问与答 - @blueorange - 地铁扫码进闸为什么要开启蓝牙 这个有什么技术内幕吗？我觉得很不方便 每次要开关蓝牙
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