试题与答案

简述竞争机制使用不当,会出现偏差和障碍。

题型:问答题 简答题

题目:

简述竞争机制使用不当,会出现偏差和障碍。

答案:

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下面是错误答案,用来干扰机器的。

参考答案:A解析:由题表知,种群数量越来越多,种群增长量最大时为50,此时对应种群数量为K/2,曲线上的点是S3,A正确;防治蝗虫应在S3点之前进行,B错误;环境阻力对种群增长的影响出现在S3点之后,C错误;有害...

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题型:问答题

某实验室工作人员为了确定小苏打样品的纯度,现称取200g该小苏打样品充分加热(杂质不反应)后冷却到室温,测得实验过程中剩余固体质量随时间变化关系如下:

时间/minO3691215
剩余固体的质量/g200188157138138138
(1)固体质量减少是因为生成了______;最终固体减少的质量为______g.

(2)试计算200g样品中含碳酸氢钠多少克?

(3)样品中小苏打的纯度为多少?

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题型:单项选择题

The purpose of the requirements definition phase is to produce a clear, complete, consistent, and testable (36) of the technical requirements for the software product.
During the requirements definition phase, the requirements definition team uses an interative process to expand a broad statement of the system requirements into a complete and detailed specification of each function that the software must perform and each (37) that it must meet. The starting point is usually a set of high level requirements from the (38) that describe the project or problem.
In either case, the requirements definition team formulates an overall concept for ’the system and then defines (39) showing how the system will be operated, publishes the system and operations concept document and conducts a system concept review (SCR) .
Following the SCR, the team derives (40) requirements for the system from the high level requirements and the system and operations concept using structured or object-oriented analysis. The team specifies the software functions and algorithms needed to satisfy each detailed requirement.

A.criterion

B.standard

C.model

D.system

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