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 143 54.4%
2 United States 51 19.4%
3 Germany 44 16.7%
4 Canada 12 4.6%
5 Russia 4 1.5%
6 Singapore 3 1.1%
7 Korea, Republic of 3 1.1%
8 Poland 1 0.4%
9 Iran, Islamic Republic of 1 0.4%
10 France 1 0.4%