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【单选题】
Which of the following is TRUE?A． When he talks or sings, Jay Chou can both speak cA.
24． Which of the following is TRUE? A． When he talks or sings, Jay Chou can both speak clearly．
B.
When he sings, Jay Chou can-t speak clearly． When he talks, he can't, either．
C.
When he talks, Jay Chou can-t speak clearly． But when he sings, he can．
D.
When he sings, Jay Chou can't speak clearly． But when he talks, he can．
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【简答题】设随机变量X服从某一区间上的均匀分布，且E(X)=3， ，则X的概率密度为______，P(X=2)=______；P(1＜X＜3)=______．
【简答题】路线加桩分为地形加桩、()、曲线加桩和关系加桩。
【单选题】设随机变量X的概率密度为 已知E(X)=2,P{1
A.
2/3
B.
1/3
C.
0.5
D.
1
【单选题】Why does the author compare Mars to Earth in paragraph 6?
A.
To emphasize that there is more water on Earth than on Mars
B.
To point out that Mars has the conditions for life to exist
C.
To state that there are no differences between Mars and Earth
D.
To explain why life emerged on Earth but not on Mars
相关题目：
【单选题】设随机变量X的概率密度为 已知E(X)=2,P{1
A.
2/3
B.
1/3
C.
0.5
D.
1