string(279) "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%8B100%E9%97%AE%E8%83%8C%E4%BC%9A%E8%83%BD%E8%BF%87%E5%90%97 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
二建机电案例100问背会能过吗
