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 52 53.1%
2 United States 14 14.3%
3 Netherlands 10 10.2%
4 Germany 9 9.2%
5 Russia 5 5.1%
6 Ukraine 2 2%
7 United Kingdom 2 2%
8 Poland 2 2%
9 Brazil 1 1%
10 France 1 1%