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quartz spring
| gravimeter
| quartz spring | |
| tech. | 石英弹簧 |
| gravimeter | |
| gen. | 重力仪 |
| avia. | 重差计 |
| hydroel.st. | 比重计 |
| met. | 重力仪; 比重 计 |
| space | 重力计 |
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| 石英弹簧 | |||
| quartz spring: 7 phrases in 2 subjects |
| Oil / petroleum | 1 |
| Technology | 6 |
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