string(273) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%81%94%E6%83%B3b51%E5%A6%82%E4%BD%95%E8%BF%9B%E5%85%A5bios%E8%AE%BE%E7%BD%AEu%E7%9B%98%E5%90%AF%E5%8A%A8 => Failed to connect to 14.18.117.71 port 38093: Connection refused"
联想b51如何进入bios设置u盘启动
