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 104 39.5%
2 United States 77 29.3%
3 Netherlands 32 12.2%
4 Germany 16 6.1%
5 Canada 13 4.9%
6 Sweden 6 2.3%
7 Russia 5 1.9%
8 Switzerland 2 0.8%
9 Korea, Republic of 2 0.8%
10 India 2 0.8%
11 France 2 0.8%
12 Japan 1 0.4%
13 Qatar 1 0.4%