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 27 24.8%
2 United States 27 24.8%
3 Netherlands 15 13.8%
4 Sweden 10 9.2%
5 Russia 9 8.3%
6 Germany 9 8.3%
7 Korea, Republic of 9 8.3%
8 Czech Republic 2 1.8%
9 Canada 1 0.9%