string(369) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E4%BB%80%E4%B9%88%E5%8F%AB%E7%B3%BB%E7%BB%9F%E9%9B%86%E6%88%90%2C%E7%B3%BB%E7%BB%9F%E9%9B%86%E6%88%90%E7%9A%84%E6%96%B9%E6%A1%88%E5%88%86%E6%9E%90%E6%B3%95%E6%9C%89%E5%93%AA%E4%BA%9B%E6%AD%A5%E9%AA%A4 => Failed to connect to 101.89.159.206 port 38100: Connection refused"
什么叫系统集成,系统集成的方案分析法有哪些步骤
