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| piezo-electric wave detector | |||
| piezoelectric detector; piezoelectric seismometer | |||
| 压 电 检波器: 13 phrases in 6 subjects |
| Air defense | 3 |
| Aviation | 2 |
| Earth sciences | 2 |
| Engineering geology | 1 |
| Oil / petroleum | 3 |
| Technology | 2 |
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