string(297) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%8B%8F27%E6%88%98%E6%9C%BA%E5%92%8Cf15%E6%88%98%E6%9C%BA%E5%93%AA%E4%B8%AA%E6%9B%B4%E5%BC%BA%E5%A4%A7%E4%B8%80%E7%82%B9%E5%91%A2 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
苏27战机和f15战机哪个更强大一点呢
