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自然γ射线石油测井仪
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自然γ射线石油测井仪
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伽马射线石油测井
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natural gamma ray petroleum well logger
自然γ射线石油测井仪
通过测量井眼内的γ射线能谱和井眼周围地层中铀、钍、钾等多种放射性元素的含量,计算出地层相关物质的组成成分的核仪器。
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covering functor
covering group
covering homomorphism
covering homotopy
covering homotopy axiom
covering homotopy property
covering homotopy theorem
covering isotopy
covering lemma
covering Lie group
covering linkage invariant
covering manifold
covering map
covering number
covering of a group
covering of a manifold
covering of a plane
covering of a set
covering of a space
covering of a surface
covering of a topological space
covering of finite order
covering of finite type
covering of Vitali
covering path
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