皮皮学，免费搜题
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【单选题】
典型的局域网交换机允许10Mb／s与100Mb／s两种网卡共存，它采用的技术是10／100Mb／s的（）。A.
线路交换
B.
令牌控制
C.
自动侦测
D.
速率变换
拍照语音搜题，微信中搜索"皮皮学"使用
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