string(292) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BA%8C%E7%BA%A7%E5%BB%BA%E9%80%A0%E5%B8%88%E6%95%99%E6%9D%90%E5%A4%A7%E7%BA%B2%E6%98%AF%E4%BB%80%E4%B9%88%E6%A0%B7%E7%9A%84 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
二级建造师教材大纲是什么样的
