string(310) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E7%BE%8E%E8%81%94%E5%82%A8%E9%87%8F%E5%8C%96%E5%AE%BD%E6%9D%BE%E5%B1%9E%E4%BA%8E%E5%85%AC%E5%BC%80%E5%B8%82%E5%9C%BA%E6%93%8D%E4%BD%9C%E5%90%97 => Failed to connect to 14.18.117.71 port 38164: Connection refused"
美联储量化宽松属于公开市场操作吗
