string(237) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=ad21%E5%8E%9F%E7%90%86%E5%9B%BE%E6%80%8E%E4%B9%88%E7%94%9F%E6%88%90pcb => Failed to connect to 101.91.112.32 port 38162: Connection refused"
ad21原理图怎么生成pcb
