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【简答题】
测绘基准是指一个国家整个测绘的()和各种测绘系统的基础。
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【简答题】Universal Studios Hollywood, a park for fun, entertainment, and even learning, is taking its first steps in a 25-year plan to expand itself. The plan is to expand the amusement facilities (设施) and dev...
【单选题】-- Let’s see the pandas first. -- __________.
A.
Why do you ask me?
B.
That sounds great. Let’s go.
C.
What animals do you like?
D.
No, I don’t.
【单选题】--Liz got the first prize in the speech contest. --____! She’s so shy that she even can’t speak in front of her friends.
A.
You’re kidding
B.
You're welcome
C.
Thank you
D.
That’s nothing
【简答题】设随机变量X～N(5，4)，求x 1 、x 2 ，使x 1 ＜x 2 且 P{X≤x 1 }:P{x 1 ＜X≤x 2 }:P{X＞x 2 }=2:37:1
【简答题】设随机变量X～N(1，4)，求函数的数学期望E(X 2 )．
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