string(281) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%BF%80%E6%B4%BBcad2020%E6%98%BE%E7%A4%BA%E6%BF%80%E6%B4%BB%E7%A0%81%E9%94%99%E8%AF%AF%E6%80%8E%E4%B9%88%E5%8A%9E => Failed to connect to 14.18.117.71 port 38164: Connection refused"
激活cad2020显示激活码错误怎么办
