string(266) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=u%E7%9B%98%E4%B8%80%E8%88%AC%E7%94%A8%E4%BB%80%E4%B9%88%E6%A0%BC%E5%BC%8F%E6%A0%BC%E5%BC%8F%E5%8C%96 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
u盘一般用什么格式格式化
