string(309) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2020%E5%B9%B4%E7%9B%91%E7%90%86%E6%95%99%E6%9D%90%E5%92%8C2023%E5%B9%B4%E7%9B%91%E7%90%86%E6%95%99%E6%9D%90%E5%8C%BA%E5%88%AB%E5%A4%A7%E5%90%97 => Failed to connect to 14.116.215.7 port 38230: Connection refused"
2020年监理教材和2023年监理教材区别大吗
