string(233) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=21%E5%B9%B4%E4%B8%80%E5%BB%BA%E7%AE%A1%E7%90%8693%E9%81%93%E9%A2%98 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
21年一建管理93道题
