BPG致力于知识的发现和传播
Total Visits of This Article
2020 | 总访问次数
排名 国家/地区 数量 占比
1 United States 45 60.8%
2 China 7 9.5%
3 Germany 6 8.1%
4 Canada 5 6.8%
5 Russia 4 5.4%
6 France 3 4.1%
7 Hong Kong 1 1.4%
8 Korea, Republic of 1 1.4%
9 Singapore 1 1.4%
10 United Kingdom 1 1.4%