string(265) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B8%82%E5%9C%BA%E6%8E%A8%E5%B9%BF%E4%B8%BB%E8%A6%81%E8%81%8C%E8%B4%A3%E6%9C%89%E5%93%AA%E4%BA%9B => Failed to connect to 14.18.117.71 port 38069: Connection refused"
市场推广主要职责有哪些
