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 43 56.6%
2 Germany 10 13.2%
3 United States 7 9.2%
4 Taiwan 5 6.6%
5 Netherlands 4 5.3%
6 India 2 2.6%
7 Kazakhstan 1 1.3%
8 Mexico 1 1.3%
9 Spain 1 1.3%
10 France 1 1.3%
11 United Kingdom 1 1.3%