string(311) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%B9%B0%E8%82%A1%E7%A5%A8%E7%9A%84%E6%97%B6%E5%80%99%E6%8D%A2%E6%89%8B%E7%8E%87%E5%A4%9A%E5%B0%91%E6%AF%94%E8%BE%83%E5%90%88%E9%80%82%E5%91%A2 => Failed to connect to 101.91.112.32 port 38221: Connection refused"
买股票的时候换手率多少比较合适呢
