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将原木或原条按树种、材种、规格和等级的一部或全部进行分类的作业,又称品等区分。选材有利于木材的贮存、保管、运输和利用木材,是森林采伐运输生产中的主要工序之一。
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cancellation law for multiplication
cancellation of collection registration
cancellation of handles
cancellation of negotiable instrument
cancellation of singularities
cancellation point
cancellation property
cancellation semigroup
cancellation subsemigroup
cancellation theorem
cancellation theory
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