string(271) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2020%E4%BA%8C%E7%BA%A7%E5%BB%BA%E9%80%A0%E5%B8%88%E6%B0%B4%E5%88%A9%E5%AE%9E%E5%8A%A1%E7%AD%94%E6%A1%88 => Failed to connect to 101.89.166.210 port 38089: Connection refused"
2020二级建造师水利实务答案
