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| 伽马-伽马测井用附有 γ 源的控制装置，沿孔壁照射岩层，以探测经岩层散射后的 γ 射线强度为基础的测井方法 | |||
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gamma-gamma logging : 28 phrases in 6 subjects |
| Earth sciences | 4 |
| Engineering geology | 1 |
| Explosives and Explosive Ordnance Disposal | 3 |
| Geophysics | 12 |
| Oil / petroleum | 4 |
| Technology | 4 |
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