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 United States 55 39%
2 China 21 14.9%
3 Germany 20 14.2%
4 Spain 15 10.6%
5 Netherlands 13 9.2%
6 Korea, Republic of 4 2.8%
7 United Kingdom 3 2.1%
8 France 2 1.4%
9 Austria 2 1.4%
10 Belgium 2 1.4%
11 Canada 2 1.4%
12 Russia 1 0.7%
13 Japan 1 0.7%