string(298) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E4%BA%8C%E5%BB%BA%E6%9C%BA%E7%94%B5%E6%A1%88%E4%BE%8B%E5%88%86%E6%9E%90%E9%A2%98%E5%8F%8A%E7%AD%94%E6%A1%88%E8%AF%A6%E8%A7%A3 => Failed to connect to 101.89.117.144 port 38056: Connection refused"
2021二建机电案例分析题及答案详解
