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| |||
| 重力制 | |||
| 自流〔自动，重力〕给料系统 | |||
| 重力循环系统 | |||
| 重力供水系统; 自流输送系统; 自动给料系统; 重力体系; 重力输送系统; 重力放矿法; 重力式 | |||
| gravity system: 77 phrases in 12 subjects |
| Automobiles | 4 |
| Aviation | 7 |
| Earth sciences | 1 |
| Electronics | 2 |
| Environment | 1 |
| Geophysics | 4 |
| Nautical | 3 |
| Oil / petroleum | 2 |
| Refrigeration | 7 |
| Space | 5 |
| Technology | 39 |
| Water resources | 2 |
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