string(310) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%85%A4%E7%9F%BF%E6%B3%A8%E5%86%8C%E5%AE%89%E5%85%A8%E5%B7%A5%E7%A8%8B%E5%B8%88%E5%A5%BD%E8%80%83%E5%90%97%E9%9A%BE%E5%BA%A6%E5%A4%A7%E5%90%97 => Failed to connect to 14.18.117.71 port 38069: Connection refused"
煤矿注册安全工程师好考吗难度大吗
