string(341) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%B9%B4%E6%B3%A8%E5%86%8C%E6%B6%88%E9%98%B2%E5%B7%A5%E7%A8%8B%E5%B8%88%E8%B5%84%E6%A0%BC%E8%80%83%E8%AF%95%E8%BE%85%E5%AF%BC%E6%95%99%E6%9D%90%E6%9C%89%E5%93%AA%E4%BA%9B => Failed to connect to 14.18.117.71 port 38093: Connection refused"
2021年注册消防工程师资格考试辅导教材有哪些
