string(258) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E8%B5%84%E6%9C%AC%E6%80%A7%E6%94%AF%E5%87%BA%E5%AE%9A%E4%B9%89%E6%98%AF%E4%BB%80%E4%B9%88 => Failed to connect to 125.88.227.171 port 38062: Connection refused"
资本性支出定义是什么
