string(276) "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%E9%9C%80%E8%A6%81%E4%B9%B0%E6%95%99%E6%9D%90%E5%90%97 => Failed to connect to 101.89.117.144 port 38005: Connection refused"
注会综合阶段需要买教材吗
