string(259) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%B1%8B%E9%A1%B6%E5%85%89%E4%BC%8F%E7%B3%BB%E7%BB%9F%E8%AE%BE%E8%AE%A1%E8%AF%B4%E6%98%8ECAD => Failed to connect to 14.18.117.71 port 38164: Connection refused"
屋顶光伏系统设计说明CAD
