string(269) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E4%BA%8C%E7%BA%A7%E5%BB%BA%E9%80%A0%E5%B8%88%E5%BB%BA%E7%AD%91%E5%B7%A5%E7%A8%8B%E7%AD%94%E6%A1%88 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
2021二级建造师建筑工程答案
