string(271) "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%E5%B8%82%E6%94%BF2020%E5%B9%B4%E8%AF%BE%E6%9C%AC%E6%94%B9%E5%8A%A8%E4%BA%86%E5%90%97 => Failed to connect to 101.89.143.195 port 38109: Connection refused"
二建市政2020年课本改动了吗
