string(284) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%85%89%E4%BC%8F%E5%8F%91%E7%94%B5%E5%AF%B9%E5%B1%8B%E9%A1%B6%E7%9A%84%E8%A6%81%E6%B1%82%E6%9C%89%E5%93%AA%E4%BA%9B => Failed to connect to 101.91.112.32 port 38221: Connection refused"
光伏发电对屋顶的要求有哪些
