string(242) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%94%B3%E8%AE%BAa%E7%B1%BB%E5%92%8Cb%E7%B1%BB%E7%9A%84%E5%8C%BA%E5%88%AB => Failed to connect to 101.89.143.195 port 38175: Connection refused"
申论a类和b类的区别
