string(305) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2020%E5%B9%B4%E9%AB%98%E7%BA%A7%E8%BF%90%E8%BE%93%E7%BB%8F%E6%B5%8E%E8%80%83%E9%A2%98%E7%B1%BB%E5%9E%8B%E7%AD%94%E6%A1%88%E8%A7%A3%E6%9E%90 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
2020年高级运输经济考题类型答案解析
