string(250) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E6%89%93%E5%BC%80%E4%B8%8D%E4%BA%86%E6%96%87%E4%BB%B6%E6%80%8E%E4%B9%88%E5%8A%9E => Failed to connect to 61.171.74.35 port 38027: Connection refused"
cad打开不了文件怎么办
