string(252) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%BB%BA%E8%AE%BE%E6%B3%95%E8%A7%84%E6%95%99%E7%A8%8B%E7%AC%AC%E5%9B%9B%E7%89%88pdf => Failed to connect to 101.89.159.206 port 38100: Connection refused"
建设法规教程第四版pdf
