问答题

当NH4＋（NH3）、NO2－、NO3－共存而且其含量又处于有效范围时，绝大多数藻类总是优先吸收利用[填空(1)]。

答案： NH4＋

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单项选择题

About the data generation stages, which sequence is correct ( )
A、Operationand business system, Perception stage, User-generated content
B、Operationand business system, User-generated content, Perception stage
C、Perceptionstage, Operation and business system, User-generated content
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