string(274) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B8%AD%E7%BA%A7%E8%B4%A2%E7%AE%A1%E5%AD%A6%E5%AE%8C%E4%B8%80%E9%81%8D%E4%B8%8D%E4%BC%9A%E5%81%9A%E9%A2%98 => Failed to connect to 14.18.117.71 port 38220: Connection refused"
中级财管学完一遍不会做题
