string(311) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2020%E7%89%88%E6%B3%A8%E5%86%8C%E5%AE%89%E5%85%A8%E5%B7%A5%E7%A8%8B%E5%B8%88%E6%95%99%E6%9D%90%E5%92%8C2022%E6%9C%89%E5%95%A5%E5%8C%BA%E5%88%AB => Failed to connect to 101.89.143.195 port 38109: Connection refused"
2020版注册安全工程师教材和2022有啥区别
