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paleobotany
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理学
古植物学
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paleobotany
古植物学
通过研究地质时期的植物化石,以追溯和重建植物界过去历史为宗旨的学科。主要研究植物化石的形态解剖、系统分类、生存条件和各门类植物的起源、发展、演化以及它们在地质时期的时空分布和生态环境等。
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position transducer
position vector
position weight matrix
position weight matrix, PWM
positivation
positive
positive affine mapping
positive aging
positive analytic function
positive and negative
positive and negative energy plane wave solutions of Dirac equation
positive and negative feedback modes of scanning electron microscope
positive angle
positive angle shot
positive asymmetry
positive bias
positive boundary
positive bounded operator
positive braid
positive bundle
positive calculus
positive chain complex
positive channel metal-oxide-semiconductor circuit
positive channel metal-oxide-semiconductor integrated circuit
positive charge
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