string(233) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2019%E6%B3%A8%E5%AE%89%E7%85%A4%E7%9F%BF%E7%B1%BB%E5%AE%9E%E5%8A%A1 => Failed to connect to 14.116.215.7 port 38225: Connection refused"
2019注安煤矿类实务
