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围网捕捞
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围网捕捞
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围网捕捞
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purse seining
围网捕捞
用长带形或一囊两长翼形网具,包围密集鱼群进行捕捞的作业方式。是捕捞海洋中上层鱼类的主要捕捞作业之一。世界海洋围网捕捞产量占海洋总捕捞产量的25%~30%。大型湖泊和水库中也有使用。
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unitary semisimilarity
unitary semi-similitude
unitary similarity
unitary similar matrix
unitary sociable number
unitary space
unitary spin
unitary subalgebra
unitary subring
unitary symmetry
unitary symplectic group
unitary transformation
unitary transformation group
unitary trick
unitary unimodular group
unitary vector space
unit ausiliary transformer
unit automatic start-up and shut-down control
unit ball
unit basis
unit bore system
unit boundary
unit box
unit brightness
unit cell
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