string(233) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%B9%B4%E7%9B%91%E7%90%86%E6%95%99%E6%9D%90%E5%8F%98%E5%8A%A8 => Failed to connect to 14.18.117.71 port 38041: Connection refused"
2021年监理教材变动
