string(269) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%B9%B4%E4%BA%8C%E5%BB%BA%E7%AE%A1%E7%90%86%E8%80%83%E8%AF%95%E7%AB%A0%E8%8A%82%E9%87%8D%E7%82%B9 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
2021年二建管理考试章节重点
