string(258) "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%E5%86%85%E5%AD%98%E8%BF%87%E5%A4%A7%E6%80%8E%E4%B9%88%E8%A7%A3%E5%86%B3 => Failed to connect to 14.18.46.51 port 38044: Connection refused"
cad文件内存过大怎么解决
