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 China 34 37%
2 United States 22 23.9%
3 Germany 12 13%
4 Netherlands 8 8.7%
5 Canada 4 4.3%
6 India 3 3.3%
7 Norway 2 2.2%
8 Spain 2 2.2%
9 2 2.2%
10 France 2 2.2%
11 Moldova, Republic of 1 1.1%