string(283) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%82%A1%E7%A5%A8%E7%9A%84%E6%8D%A2%E6%89%8B%E7%8E%87%E6%98%AF%E6%80%8E%E6%A0%B7%E7%AE%97%E5%87%BA%E6%9D%A5%E7%9A%84 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
股票的换手率是怎样算出来的
