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 34 35.4%
2 United States 24 25%
3 Netherlands 19 19.8%
4 Germany 8 8.3%
5 Korea, Republic of 4 4.2%
6 Iran, Islamic Republic of 3 3.1%
7 Taiwan 2 2.1%
8 Hong Kong 1 1%
9 India 1 1%