string(364) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%A4%A7%E6%95%B0%E6%8D%AE%E5%8F%AF%E8%A7%86%E5%8C%96%E7%9A%84%E5%9F%BA%E6%9C%AC%E7%89%B9%E5%BE%81%E4%B8%BB%E8%A6%81%E4%BD%93%E7%8E%B0%E5%9C%A8%E4%BB%A5%E4%B8%8B%E5%93%AA%E4%BA%9B%E6%96%B9%E9%9D%A2 => Failed to connect to 14.18.117.71 port 38133: Connection refused"
大数据可视化的基本特征主要体现在以下哪些方面
