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用β放射性核素制备的以发射β射线为主要特征的放射源。又称β放射源。
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Fish on the Platter
fish orbit
fish orienting machine
fish overwintering ground
fish overwintering migration
fish parasitology
fish passage facilities
fish pharmacology
fish phototaxis
fish physiology
fish population
fish population dynamics
fish population fecundity
fish population genetic characteristics
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fish postmortem
fish primordial germ cell
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