string(247) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%87%80%E5%88%A9%E6%B6%A6%E7%9A%84%E5%85%AC%E5%BC%8F%E6%80%8E%E4%B9%88%E7%AE%97 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
净利润的公式怎么算
