BPG致力于知识的发现和传播
Total Visits of This Article
2021 | 总访问次数
排名 国家/地区 数量 占比
1 China 9 28.1%
2 United States 8 25%
3 Russia 3 9.4%
4 Cyprus 3 9.4%
5 Germany 3 9.4%
6 Iran, Islamic Republic of 2 6.2%
7 Korea, Republic of 2 6.2%
8 Netherlands 2 6.2%