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 19 24.4%
2 United States 18 23.1%
3 Netherlands 15 19.2%
4 Canada 9 11.5%
5 Germany 8 10.3%
6 Russia 4 5.1%
7 Iran, Islamic Republic of 3 3.8%
8 Czech Republic 1 1.3%
9 France 1 1.3%