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问题 不定项选择

某电场的电场线分布如图所示，以下说法正确的是

[ ]

A．c点场强大于b点场强

B．a点电势高于b点电势

C．若将一试探电荷+q由a点释放，它将沿电场线运动到b点

D．若在d点再固定一点电荷-Q，将一试探电荷+q由a移至b的过程中，电势能减小答案

答案

BD

单项选择题

Estimating schedule activity costs involves developing an（）of the costs of the resources needed to complete each schedule activity. Cost estimating includes identifying and considering various costing alternatives. For example, in most application areas, additional work during a design phase is widely held to have the potential for reducing the cost of the execution phase and product operations. The cost estimating process considers whether the expected savings can offset the cost of the additional design work. Cost estimates are generally expressed in units of（）to facilitate comparisons both within and across projects.The（）describes the business need, justification, requirements, and current boundaries for the project. It provides important information about project requirements that is considered during cost estimating.

Cost estimates are generally expressed in units of（）to facilitate comparisons both within and across projects.

A．activity

B．work

C．currency

D．time
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填空题 案例分析题

回答下列问题。

 

经调查，第一年此种昆虫种群数量为N0，如果在理想条件下，每年增长率保持不变，且λ=1.3，第三年该种群数量为（）。
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