string(267) "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%E6%80%BB%E9%A2%9D%E7%9A%84%E8%AE%A1%E7%AE%97%E5%85%AC%E5%BC%8F%E6%98%AF => Failed to connect to 101.89.143.195 port 38109: Connection refused"
净利润总额的计算公式是
