string(276) "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%E5%A4%9A%E5%B0%91%E4%B8%BA%E5%90%88%E9%80%82%E5%80%BC => Failed to connect to 101.89.117.144 port 38076: Connection refused"
股票的换手率多少为合适值
