string(273) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=%E5%88%9D%E7%BA%A7%E4%BC%9A%E8%AE%A12021%E6%95%99%E6%9D%90%E5%92%8C2020%E6%9C%89%E5%95%A5%E5%8C%BA%E5%88%AB => Failed to connect to 61.171.74.35 port 38041: Connection refused"
初级会计2021教材和2020有啥区别
