string(246) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%B1%9F%E6%81%A9%E8%A7%92%E5%BA%A6%E7%BA%BF%E5%85%AC%E5%BC%8F%E6%BA%90%E7%A0%81 => Failed to connect to 14.18.46.51 port 38206: Connection refused"
江恩角度线公式源码
