string(289) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%B9%B4%E4%B8%80%E5%BB%BA%E6%B0%B4%E5%88%A9%E5%AE%9E%E5%8A%A1%E6%95%99%E6%9D%90%E6%9C%89%E5%8F%98%E5%8C%96%E5%90%97 => Failed to connect to 101.89.159.206 port 38100: Connection refused"
2021年一建水利实务教材有变化吗
