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【单选题】
设随机变量( X, Y) 的分布函数为F(x,y),若对平面的某一点 , 有 , 则随机变量 X 与 Y 不独立 . A.√ B.×A.
1
B.
2
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【简答题】一个天文单位是指：
【单选题】They returned form a _____ trip to the United States.
A.
three day
B.
three day's
C.
three-days
D.
three-day
【简答题】一个天文单位是指________,其数量约为_______。
【单选题】A company that produces racing motorbikes has several models that sell well within the motorcycle racing community and which are very profitable for the company. Despite having a profitable product, w...
A.
Profits from the sales of popular models will be lost when returned to the shareholders in the form of dividends.
B.
New models will require a lot of money to develop and bring to market before they generate any revenue.
C.
The company will have built up debts which must be repaid in order to bring the current models to market.
D.
Equity must be raised to finance the development of new models to replace the existing models.
【简答题】天文学上常用“天文单位”来表示距离，一个天文单位指的是（ ）。
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