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氩-氩年代测定
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氩-氩年代测定
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氩-氩年代测定
利用中子活化法使样品中的39K经过39K(n,p)39Ar反应转化为39Ar,然后用质谱计测定其40Ar/39Ar的比值,代替通常在钾-氩法中的40Ar/40K比值,计算岩石或矿物的地质年龄。
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center of perspectivity
center of polarity
center of principal curvature
center of projection
center of purity
center of range
center of reduction
center of reflection
center of rotation
center of similarity
center of similitude
center of subsidence
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Center of the World
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center point grounding resister
center-projective
centers for supervision, inspection and testing of agricultural genetically modified organisms of Ministry of Agriculture and Rural Affairs of China
Centers for the Acquisition and Dissemination of Scientific and Technical Information
centers method
centers of crop diversity
centers of origin of crops
Center Stage
center surface
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