string(319) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E5%86%8C%E5%AE%89%E5%85%A8%E5%B7%A5%E7%A8%8B%E5%B8%88%E7%85%A4%E7%82%AD%E4%B8%93%E4%B8%9A%E5%93%AA%E4%B8%AA%E8%80%81%E5%B8%88%E8%AE%B2%E7%9A%84 => Failed to connect to 61.171.74.35 port 38041: Connection refused"
注册安全工程师煤炭专业哪个老师讲的
