string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E5%BB%BA%E7%9A%84%E5%85%AC%E5%85%B1%E8%AF%BE%E6%98%AF%E5%93%AA%E4%B8%A4%E7%A7%91 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
二建的公共课是哪两科
