string(283) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%A0%94%E5%8F%91%E6%94%AF%E5%87%BA%E5%B1%9E%E4%BA%8E%E4%BB%80%E4%B9%88%E7%A7%91%E7%9B%AE%E7%B1%BB%E5%88%AB%E7%9A%84 => Failed to connect to 61.171.74.35 port 38027: Connection refused"
研发支出属于什么科目类别的
