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ecological recovery of farmland
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ecological recovery of farmland
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理学
农田生态恢复
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ecological recovery of farmland
农田生态恢复
对耕地质量受损的农田用生态友好方法加以修复和改善,使农田生产力得到恢复的过程。
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homotopy exact sequence
homotopy excision
homotopy excision homomorphism
homotopy excision theorem
homotopy extension
homotopy extension property
homotopy extension theorem
homotopy fiber
homotopy functor
homotopy group
homotopy group functor
homotopy group of a triad
homotopy group of CW complexes
homotopy group of spheres
homotopy identity
homotopy invariance
homotopy invariant
homotopy invariant functor
homotopy inverse
homotopy inverse mapping
homotopy length
homotopy lifting
homotopy lifting property
homotopy lifting theorem
homotopy method
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