string(251) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%9C%89%E4%BA%9Bcad%E5%9B%BE%E6%89%93%E4%B8%8D%E5%BC%80%E6%80%8E%E4%B9%88%E5%8A%9E => Failed to connect to 101.91.112.32 port 38221: Connection refused"
有些cad图打不开怎么办
