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【单选题】
度量风险大小常常使用离散系数这个统计量。关于离散系数的说法，正确额是()。A.
离散系数是期望值与方差的比值
B.
离散系数越大，损失分布越均匀
C.
离散系数是期望值与标准差的乘积
D.
经济单位的损失分布的离散系数越小，财务稳定性越强
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