题目内容
计算风险事件的期望值是通过（）。
A. 事件发生的可能性乘以事件发生的结果
B. 事件发生的可能性乘以风险事件的次数
C. 风险事件的数目乘以事件发生的结果
D. 风险最大的事件发生概率乘以风险最低的事件发生的可能性
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