string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E7%BA%A7%E7%BB%8F%E6%B5%8E%E5%B8%88%E8%80%83%E8%AF%95%E7%9F%A5%E8%AF%86%E7%82%B9%E5%BD%92%E7%BA%B3 => Failed to connect to 218.78.59.96 port 38043: Connection refused"
中级经济师考试知识点归纳
