string(267) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B6%88%E9%98%B2%E5%B7%A5%E7%A8%8B%E5%B8%88%E6%95%99%E6%9D%90%E4%B8%8B%E8%BD%BD%E5%AE%98%E7%BD%91 => Failed to connect to 101.89.143.195 port 38175: Connection refused"
消防工程师教材下载官网
