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[判断题]
函数型计算器有3种角度单位制,其中GRAD是400进位制,即一个圆周角等于400g,1g=100c,1c=100cc。()
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设随机变量X与Y相互独立,其中X的概率分布为
而Y是连续型随机变量,其概率密度为f(y),令随机变量U=X+Y,求证U的分布函数G(u)是连续函数。
Before going to school,Joseph spent a lot of his time________.
A.watching liens on the grassland
B.getting food and water for his family
C.taking care of his family’s cattle
D.visiting his friends from place to place