string(339) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E6%88%91%E5%9B%BD%E7%BD%91%E7%BB%9C%E8%90%A5%E9%94%80%E7%9A%84%E5%8F%91%E5%B1%95%E9%9D%A2%E4%B8%B4%E7%9A%84%E4%B8%BB%E8%A6%81%E9%97%AE%E9%A2%98%E6%9C%89%E5%93%AA%E4%BA%9B => Failed to connect to 101.89.143.195 port 38109: Connection refused"
我国网络营销的发展面临的主要问题有哪些
