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【多选题】
几何平均数的计算应满足的条件是（）。A.
若干个比率的乘积等于总比率
B.
若干个比率之和等于总比率
C.
若干个速度相乘结果是总速度
D.
相乘的各比率必须是正数
E.
相乘的各速度不能为负数
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A.
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B.
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