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农学
草地围封
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采用人为干预手段将草场划分为若干小区并加之围栏后,排除放牧干扰(例如家畜的践踏、采食及粪便等) 而达到调节草地生态系统草食动物与植物关系的草地管理手段。
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universal principal bundle
universal problem
universal product
universal product code
universal production line
universal profinite group
universal projective cone
universal property
universal proposition
universal quantification elimination
universal quantification introduction
universal quantifier
universal quantor
universal quantum cloning
universal quantum computer
universal quantum gate
universal quantum gates
universal quasi-chemical activity-coefficient
universal recursive function
universal relation
universal representation
universal R matrix
universal R-matrix
universal scaling function
universal seismograph
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