group selection system

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1.	羣状择伐作业丝锁气压计... ... "植物羣落团"," Group of formations" "羣状择伐作业"," Group selection system" "羣状作业"," Group-system" ... www.guandang.com
2.	划伐作业林学专... ... 划伐作业；群状择伐作业 group selection system；group selection management 经营林；施业林；生产林 manage… 140.127.11.120

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