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种子生产
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种子生产
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种子生产
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seed production
种子生产
在保持优良品种群体遗传组成不变的条件下迅速对其扩大繁殖的过程。
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covering domain
covering element
covering epithelium
covering family
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
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