string(282) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2020%E4%BA%8C%E5%BB%BA%E5%B8%82%E6%94%BF%E7%B2%BE%E8%AE%B2%E8%AE%B2%E4%B9%89-%E9%99%88.%E6%98%8E%E6%95%99%E6%8E%88 => Failed to connect to 101.89.117.144 port 38076: Connection refused"
2020二建市政精讲讲义-陈.明教授
