string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%80%E4%B9%88%E6%98%AF%E8%82%A1%E7%A5%A8%E4%B8%AD%E7%9A%84%E6%8D%A2%E6%89%8B%E7%8E%87%E5%91%A2 => Failed to connect to 14.116.215.7 port 38225: Connection refused"
什么是股票中的换手率呢
