[{"title":"( 3 个子文件 9.97MB ) USB协议规范1.1/2.0/3.0 英文高清完整PDF版","children":[{"title":"USB 3 0 (11132008)-final.pdf <span style='color:#111;'> 3.38MB </span>","children":null,"spread":false},{"title":"usb_20.pdf <span style='color:#111;'> 5.71MB </span>","children":null,"spread":false},{"title":"usb11.pdf <span style='color:#111;'> 1.93MB </span>","children":null,"spread":false}],"spread":true}]