string(292) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%B7%E6%A0%BC%E7%AD%96%E7%95%A5%E5%8C%85%E6%8B%AC%E5%93%AA%E4%BA%9B%E5%86%85%E5%AE%B9%E4%B8%BE%E4%BE%8B%E8%AF%B4%E6%98%8E => Failed to connect to 14.18.117.71 port 38220: Connection refused"
价格策略包括哪些内容举例说明
