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【简答题】
如果对于任意实数a,b(a<b),随机变量X满足P(a<X≤b)= ∫ ba ? μ,σ (x)dx ,称随机变量X服从正态分布,记为N(μ,σ 2 ),若X~(0,1),P(X>1)=p,则 ∫ 0-1 ? μ,σ (x)dx =______.
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参考答案:
举一反三
【单选题】十二指肠钩虫口囊的特征是:( )
A.
背侧2对钩齿
B.
腹侧2对钩齿
C.
背侧1对板齿
D.
腹侧1对板齿
E.
背侧1对板齿,腹侧1对钩齿
【单选题】The fact that people immigrate to Chicago from around the world, which makes Chicago a multinational city.
A.
Y
B.
N
C.
NG
【判断题】弯曲裂纹最先在外侧出现。
A.
正确
B.
错误
【简答题】(13分)现有下列短周期元素性质的相关数据: ① ② ③ ④ ⑤ ⑥ 原子半径(10-10m) 1.30 0.82 0.99 1.11 0.90 1.18 最高或最低化合价 +2 +3 +7 +4 +2 +3 -1 -4 请回答下列问题: (1)②和③形成的化合物类型为 (填“离子”或“共价”)化合物; (2)元素①的金属性比元素⑥要 (填“强”或“弱”),试从原子结构方面解释其原因: ; (3)...
【单选题】______ Chicago is a beautiful city today, but ______ Chicago of the 1920s was a very dirty place.
A.
The the
B.
//
C.
A the
D.
/the
【单选题】十二指肠钩虫口囊的特征是( )
A.
背侧2对钩齿
B.
腹侧2对钩齿
C.
背侧1对板齿
D.
腹侧1对板齿
E.
腹侧1对钩齿
【单选题】Since Chicago is north of Washington, and Washington is north of Charleston, Chicago is north of Charleston.
A.
Chicago is north of Washington. Washington is north of Charleston. _____________________________ ∴ Chicago is north of Charleston.
B.
Chicago is north of Charleston. Washington is north of Charleston. ____________________________ ∴ Chicago is north of Washington.
【单选题】Sandy sits in front of Amy, but behind Simon. So Sandy sits ______ Amy ______ Simon. [     ]
A.
next; to
B.
next to; beside
C.
between; and
D.
opposite; at
【单选题】一个B类地址的前两位是()
A.
01
B.
10
C.
11
D.
不确定
【单选题】One's first impression of Chicago may be ______.
A.
large population
B.
streams of cars
C.
the late spring
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