string(204) "get document error:https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B8%85%E7%90%86cad%E6%96%87%E4%BB%B6%E9%87%8C%E7%82%B9 => Connection timed out after 30001 milliseconds"
清理cad文件里点网!