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举一反三
【单选题】A close analogy to a study design is the rough sketch made by an artist before he commits his vision to canvas(画布). The broad outlines are drawn, the proper perspective achieved, and the total impact ...
A.
doing research and drawing a picture
B.
research finding and picture’’s perspective
C.
designing a research and making a quick drawing
D.
a researcher and a painter
【单选题】Elephants who paint aren’t new. Paintings by Ruby, an Asian elephant who lived at the Phoenix Zoo in Arizona, sold for up to $ 5,000 in the late 1980s, said Dick George, a consultant with the zoo. "Ru...
A.
who was sold for a price as high as $ 5,000
B.
who was famous for being the first painting elephant
C.
whose paintings sold for as high as $ 5,000
D.
who started painting in the late 1980s
【多选题】随机变量的分布包含（ ）。
A.
随机变量可能取哪些值，或在哪个区间上取值
B.
随机变量在某一确定区间上取值的概率是多少
C.
随机变量的取值频率是多少
D.
随机变量在任一区间的取值频率是多少
E.
随机变量取这些值的概率是多少，或在任一区间上取值的概率是多少