string(308) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=cad2012%E6%BF%80%E6%B4%BB%E6%97%B6%E6%98%BE%E7%A4%BA%E6%BF%80%E6%B4%BB%E7%A0%81%E9%94%99%E8%AF%AF%E6%98%AF%E4%BB%80%E4%B9%88%E5%8E%9F%E5%9B%A0 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
cad2012激活时显示激活码错误是什么原因
