string(260) "get document error：https://zhidao.baidu.com/search?lm=0&rn=10&pn=0&fr=search&dyTabStr=null&word=2021%E5%B9%B4cpa%E6%95%99%E6%9D%90%E8%BF%98%E9%80%82%E5%90%882023%E5%B9%B4%E8%80%83%E5%90%97 => Failed to connect to 101.89.117.144 port 38056: Connection refused"
2021年cpa教材还适合2023年考吗
