1、单选题:For fish growth in the aquatic ecosystem, dissolved oxygen is a( )。选项:A:general ecological factorB:limiting factorC:abiotic factorD:biotic factor答案: 【limiting factor】
2、单选题:...
1、单选题:The unit operation of separation of gas mixture based on the difference of components’solubility is . 利用气体各组分在液体中的溶解度的不同而实现气体分离的单元操作是。( )选项:A:Absorpt...