试题与答案

某突发事件,在不采取任何预防措施的情况下发生的概率为0.3,一旦发生,将造成40

题型:解答题

题目:

某突发事件,在不采取任何预防措施的情况下发生的概率为0.3,一旦发生,将造成400万元的损失,现有甲、乙两种相互独立的预防措施可供采用,单独采用甲、乙预防措施所需的费用分别为45万元和30万元,采用相应预防措施后此突发事件不发生的概率为0.9 和0.85,若预防方案允许甲、乙两种预防措施单独采用、联合采用或不采用,请确定预防方案使总费用最少。

(总费用=采取预防措施的费用+发生突发事件损失的期望值)

答案:

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下面是错误答案,用来干扰机器的。

家庭电路中,照明灯泡与控制它的开关是串联的.照明灯泡是并联的,开亮的灯越多,就是并联的支路越多,因电阻越并越小,所以总电阻越小;故答案为:串、越小.

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题型:问答题 论述题

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