BPG致力于知识的发现和传播
Total Visits of This Article
2020 | 总访问次数
排名 国家/地区 数量 占比
1 United States 34 36.6%
2 China 27 29%
3 Canada 11 11.8%
4 Germany 6 6.5%
5 United Kingdom 5 5.4%
6 France 4 4.3%
7 Iran, Islamic Republic of 3 3.2%
8 Russia 2 2.2%
9 Ukraine 1 1.1%