单项选择题

腰肉：主要包括：半膜肌、内收肌、股薄肌等。
A、正确
B、错误

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单项选择题

Kids， I hope you’ll remember the good old days____we spent together in junior high though it’s time to say goodbye. A.
design B.
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多项选择题

不受数据极端值影响的描述统计量是（）

A．均值
B．中位数
C．标准差
D．分位数