string(256) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B4%B2%E9%99%85%E5%AF%BC%E5%BC%B9%E7%9A%84%E7%9B%B4%E5%BE%84%E6%98%AF%E5%A4%9A%E5%B0%91 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
洲际导弹的直径是多少
