string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B3%A8%E4%BC%9A%E7%BB%BC%E5%90%88%E9%98%B6%E6%AE%B5%E6%9C%89%E5%AE%98%E6%96%B9%E6%95%99%E6%9D%90%E5%90%97 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
注会综合阶段有官方教材吗
