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关一 开 : 27 phrases in 16 subjects |
Architecture | 1 |
China | 1 |
Commerce | 1 |
Economy | 1 |
Electronics | 1 |
General | 2 |
Geophysics | 5 |
Lighting other than cinema | 2 |
Navigation | 1 |
Nuclear and fusion power | 1 |
Oil / petroleum | 2 |
Project management | 1 |
Rail transport | 2 |
Space | 1 |
Technology | 4 |
Wind Energy | 1 |