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【简答题】
设连续型随机变量 X 的密度函数和分布函数分别为 f ( x ) 和 F ( x ) , 则下列选项中正确的是 ( ). A. B. C. D.
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举一反三
【简答题】passage1
【简答题】Teachers and parents usually pay attention to the pictures when they read storybooks to preschool children. But a new study suggests that paying attention to the words and letters on the page may lead...
【单选题】passage1
A.
How to change the design of the kitchen
B.
How to improve the taste of foods.
C.
How to change and improve the way people do things in the kitchen.
D.
How to sense what is going on in the kitchen.
【单选题】passage1
A.
No one knows for sure when they came into being.
B.
No one knows exactly where they were first made.
C.
No one knows for what purpose they were invented.
D.
No one knows what they will look like in the future.
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