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 United States 19 28.8%
2 China 14 21.2%
3 Netherlands 14 21.2%
4 Canada 8 12.1%
5 Czech Republic 3 4.5%
6 Germany 3 4.5%
7 Iran, Islamic Republic of 2 3%
8 Taiwan 2 3%
9 Russia 1 1.5%