string(276) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%88%9B%E4%B8%9A%E9%A1%B9%E7%9B%AE%E7%9A%84%E9%80%89%E6%8B%A9%E4%BE%9D%E6%8D%AE%E6%98%AF%E5%93%AA%E4%BA%9B => Failed to connect to 101.89.117.144 port 38017: Connection refused"
创业项目的选择依据是哪些
