string(285) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E6%9C%BA%E7%94%B5%E6%A1%88%E4%BE%8B%E9%A2%98%E5%BA%93%E5%8F%8A%E7%AD%94%E6%A1%88%E8%A7%A3%E6%9E%90 => Failed to connect to 125.88.227.171 port 38062: Connection refused"
二建机电案例题库及答案解析
