string(236) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=ad20%E5%8E%9F%E7%90%86%E5%9B%BE%E5%A6%82%E4%BD%95%E7%94%9F%E6%88%90pcb => Failed to connect to 61.171.74.35 port 38041: Connection refused"
ad20原理图如何生成pcb
