string(320) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%80%E7%BA%A7%E6%B3%A8%E5%86%8C%E5%AE%89%E5%85%A8%E5%B7%A5%E7%A8%8B%E5%B8%88%E5%92%8C%E4%BA%8C%E7%BA%A7%E6%80%8E%E4%B9%88%E5%8C%BA%E5%88%AB%E5%91%A2 => Failed to connect to 101.91.112.32 port 38162: Connection refused"
一级注册安全工程师和二级怎么区别呢
