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联想专用版本4G模块全网通
联想 X270T470T470S T470P P51P71S 2017 X1 4G模块上网卡 EM7455
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2017x1联想上网4G模块
X270T470T470S T470P P51P71S 2017 X1 4G模块上网卡 EM7455
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