string(238) "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%E4%B8%93%E4%B8%9A%E7%9F%A5%E8%AF%86%E9%A2%98%E5%9E%8B => Failed to connect to 14.18.117.71 port 38069: Connection refused"
中级专业知识题型
