题目内容

若被输送的流体粘度增高,则离心泵的压头,流量,效率,轴功率。（填“减小”或“增大”）

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Agroup of species that coexist in a space and time and interact with one another directly or indirectly is called ( )

Places where many species reach the edges of their distributions is called ( )

A species that has a disproportionate不成比例impact on the community relative to its abundance is called ( )

Relative abundance means counting all individuals of each species in a number of sample plots within a community and determining what percentage each contributes to the total number of individual of all species.

A. 对
B. 错