string(244) "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%E6%A1%88%E4%BE%8B%E5%88%86%E6%9E%90 => Failed to connect to 101.89.159.206 port 38075: Connection refused"
2020二建机电案例分析
