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【多选题】
在下列哪些情况下，必须计算离散系数来比较两数列的离散程度大小（ ）A.
两数列的平均数差异很大
B.
离散程度不同
C.
两数列的平均数相等
D.
两数列的计量单位不同
E.
两数列的标准差相等
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C.
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have been brought into
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【单选题】Many countries have sent up man－made communication satellites to _____ the earth, which is made
A.
67. Many countries have sent up man-made communication satellites to _____ the earth, which is made possible for each household to use TV. A．move
B.
round
C.
circle
D.
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A.
happened
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made sure
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stayed
【简答题】Man-made beauty is a new word in recent years. Many people, mostly young girls, beautify themselves by various operations. How do you comment on this phenomenon? Write a composition of about 200 words...
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