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| 压力保持 | |||
| 压力维持 | |||
| pressure maintenance: 18 phrases in 7 subjects |
| Drilling | 2 |
| Hydroelectric power stations | 1 |
| Management | 1 |
| Mining | 3 |
| Oil / petroleum | 4 |
| Rail transport | 1 |
| Technology | 6 |
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