string(271) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%81%94%E6%83%B3b50%E6%80%8E%E4%B9%88%E8%BF%9B%E5%85%A5u%E7%9B%98%E5%90%AF%E5%8A%A8%E6%A8%A1%E5%BC%8F => Failed to connect to 101.89.159.206 port 38075: Connection refused"
联想b50怎么进入u盘启动模式
