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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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seabed active sand wave
seabed mineral resources investigation
seabed sampler
seabed sediment survey
seabed shallow drilling
seabed shallow gas
seabed solid mineral resources
seabed surface sediment detection system
seabed survey in-situ
seabirds
seaborgium
seaborne launch
sea bottom heat flow measurement
sea bottom reverberation
sea cave
sea coast
sea compass
sea creatures characters
sea-crossing bridge
sea-crossing elevation transferring survey
sea-crossing engineering
sea cucumber
sea cucumber triterpene glycosides(saponins)
sea damage
Sea dike of the Netherlands
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