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脉冲声波 : 34 phrases in 9 subjects |
| Business | 3 |
| Construction | 1 |
| Earth sciences | 1 |
| Engineering geology | 1 |
| General | 1 |
| Metallurgy | 3 |
| Oil / petroleum | 3 |
| Plastics | 2 |
| Technology | 19 |
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