usb1.1cnpdf ...........\01 绪论.pdf ...........\02 术语和缩略词.pdf ...........\04 USB数据流模型.pdf ...........\06 USB电气特性.pdf ...........\08 USB协议层.pdf ...........\09 USB设备架构.pdf ...........\10 USB主机硬件与软件.pdf ...........\11 集线器规范.pdf ...........\标准设备请求表.pdf