string(252) "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%E6%94%B9%E7%89%88%E6%97%B6%E9%97%B4 => Failed to connect to 101.91.112.32 port 38162: Connection refused"
2020年监理教材改版时间
