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 67 45.3%
2 United States 35 23.6%
3 Netherlands 16 10.8%
4 France 6 4.1%
5 Korea, Republic of 6 4.1%
6 Canada 5 3.4%
7 Germany 5 3.4%
8 Russia 3 2%
9 Sweden 2 1.4%
10 Trinidad and Tobago 2 1.4%
11 Serbia 1 0.7%