生物量（Biomass）
生物量（Biomass）
相关考题：
Dr. Myers and other researchers hold that ________.[A] people should look for a baseline that can’t work for a longer time[B] fisheries should keep the yield below 50% of the biomass[C] the ocean biomass should restored its original level[D] people should adjust the fishing baseline to changing situation
The author seems to be mainly concerned with most fisheries’ ________.[A] management efficiency[B] biomass level[C] catch-size limits[D] technological application
Dr Myers and other researchers hold thatA. people should look for a baseline that can’t work for a longer time. B. fisheries should keep the yield below 50% of the biomass C. the ocean biomass should restored its original level. D. people should adjust the fishing baseline to changing situation
The author seems to be mainly concerned with most fisheries’A.management efficiency B.biomass level C.catch-size limits D.technological application.
根据《环境影响评价技术导则—生态影响》，二级评价生态现状调查应做()工作。A:物种多样性调查可依据已有资料推断，但生物量要实测B:生物量和物种多样性调查实测—定数量的、具有代表性的样方予以验证推断的结果C:生物量调查可依据已有资料推断，但物种多样性要实测D:生物量和物种多样性调查可依据已有资料推断
单选题某雨林系统中有4种啮齿动物，其平均个体生物量分别是20、30、40和50克，试问在其它所有条件相同情况下，哪个物种的相对多度较高。（）A生物量为20克的物种B生物量为30克的物种C生物量为40克的物种D生物量为50克的物种
多选题根据《环境影响评价技术导则生态影响》，二级评价生态现状调查应做( )工作。A物种多样性调查可依据已有资料推断，但生物量要实测B生物量和物种多样性调查可实测一定数量的、具有代表性的样方予以验证推断的结果C生物量调查可依据已有资料推断，但物种多样性要实测D生物量和物种多样性调查可依据已有资料推断