string(254) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=ad16%E6%80%8E%E4%B9%88%E4%BB%8E%E5%8E%9F%E7%90%86%E5%9B%BE%E5%88%B0pcb%E6%9D%BF%E5%9B%BE => Failed to connect to 14.18.117.71 port 38220: Connection refused"
ad16怎么从原理图到pcb板图
