string(253) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2020%E5%B9%B4%E7%85%A4%E7%9F%BF%E5%85%B8%E5%9E%8B%E4%BA%8B%E6%95%85%E6%A1%88%E4%BE%8B => Failed to connect to 101.89.117.144 port 38208: Connection refused"
2020年煤矿典型事故案例
