string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E4%BC%9A%E6%88%98%E7%95%A5%E5%AD%A6%E5%A4%9A%E4%B9%85%E8%83%BD%E8%80%83%E8%BF%87 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
注会战略学多久能考过
