string(260) "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%E6%9C%BA%E7%94%B5%E5%AE%9E%E5%8A%A1%E7%AD%94%E6%A1%88%E6%9C%80%E6%96%B0 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
2020二建机电实务答案最新
