string(341) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2020%E5%B9%B4%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%9F%BF%E5%AE%89%E5%85%A8%E4%B8%93%E4%B8%9A%E9%A2%98%E5%BA%93%E5%8F%8A%E7%AD%94%E6%A1%88 => Failed to connect to 218.78.59.96 port 38042: Connection refused"
2020年注册安全工程师煤矿安全专业题库及答案
