usb
USB，是英文UniversalSerialBus（通用串行总线）的缩写，是一个外部总线标准，用于规范电脑与外部设备的连接和通讯。是应用在PC领域的接口技术。
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6,022
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this come from alter ,you can look and find it on line about USB
this come from alter ,you can look and find it on line about USB
2015-12-03
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