string(250) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad%E6%96%87%E4%BB%B6%E6%80%8E%E4%B9%88%E6%B8%85%E7%90%86%E5%9E%83%E5%9C%BE%E5%8C%85 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
cad文件怎么清理垃圾包
