string(319) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E5%86%8C%E5%AE%89%E5%85%A8%E5%B7%A5%E7%A8%8B%E5%B8%88%E8%80%83%E8%AF%95%E7%9A%84%E7%A7%91%E7%9B%AE%E6%9C%89%E5%93%AA%E4%BA%9B%E9%A2%98%E5%9E%8B => Failed to connect to 61.171.74.35 port 38041: Connection refused"
注册安全工程师考试的科目有哪些题型
