string(247) "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%E7%9A%84%E6%8A%A5%E5%90%8D%E8%B4%B9%E6%98%AF%E5%A4%9A%E5%B0%91 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
中级的报名费是多少
