保 持 时间 : 40 phrases in 15 subjects |
Animal husbandry | 1 |
Automobiles | 1 |
Badminton | 1 |
Business | 2 |
Chemistry | 1 |
Communications | 1 |
Electronics | 14 |
General | 2 |
Geology | 2 |
Information technology | 1 |
Power system protection | 1 |
Space | 2 |
Sports | 1 |
Technology | 5 |
Telecommunications | 5 |