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| 检索系统 | |||
| 搜索系统〔设备〕 | |||
| 搜索系统 | |||
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Search System : 70 phrases in 17 subjects |
| Air defense | 4 |
| Automobiles | 2 |
| Aviation | 8 |
| Earth sciences | 6 |
| Economics | 1 |
| Electronic commerce | 2 |
| Electronics | 18 |
| Fishery fishing industry | 1 |
| General | 1 |
| Geology | 1 |
| Librarianship | 1 |
| Military | 1 |
| Nautical | 1 |
| Navigation | 1 |
| Space | 13 |
| Technology | 7 |
| Telecommunications | 2 |