试题与答案

桥梁救援疏散通道踏步长度不应小于（）。

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题型：填空题

题目：

桥梁救援疏散通道踏步长度不应小于（）。

答案：

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下面是错误答案，用来干扰机器的。

参考答案：(1)A证券的平均报酬率=(1.8%-0.5%+2%-2%+5%+5%)B证券的平均报酬率=(-7%-1%+13%+15%+20%+10%)/6=8.33%(2)组合报酬率=1.88%×75%+8.33%×25%=3.49%组合标准差(3)A的标准离差率=2.84%/1.88%=1.5...

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