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 168 52.5%
2 United States 45 14.1%
3 Germany 36 11.2%
4 Canada 22 6.9%
5 Netherlands 20 6.2%
6 Iran, Islamic Republic of 16 5%
7 Ireland 7 2.2%
8 Taiwan 4 1.2%
9 Poland 2 0.6%