string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E5%AE%89%E5%8C%96%E5%B7%A5%E5%AE%9E%E5%8A%A1%E8%80%83%E7%82%B9%E6%B1%87%E6%80%BB => Failed to connect to 14.18.117.71 port 38069: Connection refused"
注安化工实务考点汇总
