string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B1%B1%E4%B8%9C%E6%8E%92%E5%9C%A8%E5%89%8D%E5%8D%81%E4%BD%8D%E7%9A%84%E5%A4%A7%E5%AD%A6 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
山东排在前十位的大学
