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| 自然伽马测井仪 | |||
| 自然伽马下井仪 | |||
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| 伽马测井仪; 自然伽乌测井下井仪 | |||
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gamma ray tool : 24 phrases in 4 subjects |
| Drilling | 3 |
| Earth sciences | 1 |
| Geophysics | 13 |
| Oil / petroleum | 7 |
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