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USBD — Universal serial bus device
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![程式亂亂寫: USB 簡介[7] - Zero Length Packet](http://2.bp.blogspot.com/-46lWX3XTcOk/U_mPeR4-E5I/AAAAAAAAoAQ/-ZYhkPhws0U/s1600/zero_length_packet_2.png "程式亂亂寫: USB 簡介[7] - Zero Length Packet")
程式亂亂寫: USB 簡介[7] - Zero Length Packet
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