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| operation and. maintenance: 107 phrases in 24 subjects |
| Agriculture | 2 |
| Air defense | 2 |
| Aviation | 13 |
| Business | 3 |
| Commerce | 1 |
| Communications | 4 |
| Computer networks | 2 |
| Earth sciences | 2 |
| Economy | 7 |
| Electronics | 21 |
| Exhibitions | 1 |
| Finances | 1 |
| General | 1 |
| Hydroelectric power stations | 5 |
| Information technology | 5 |
| Management | 1 |
| Project management | 6 |
| Rail transport | 2 |
| Shipbuilding | 1 |
| Space | 2 |
| Technology | 13 |
| Telecommunications | 9 |
| Water resources | 2 |
| Wind Energy | 1 |
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