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【单选题】
设总体X服从正态分布 ,其中 已知,若样本容量n和置信水平为 均不变,则对于不同的样本观测值,总体均值 的置信区间的长度( )A.
变大
B.
变小
C.
不变
D.
不确定
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【简答题】The reason why he adapted to the new situations quickly is that he has a(n) __________ attitude. [A] changeable [B] alternate [C] movable [D] flexible
【简答题】What he wants is _______ his mother as quickly as he can; and what he must do is ____ to the hospital at once． A．to see; going B．to see; go C．see; to go D．see; go
【简答题】When Webster was young ,he was a teacher .But he quickly became tired of the books he used in class .They were all about the English people and places .Since he wanted books that would be interesting ...
【简答题】如图，（1）∵∠1=﹙ ﹚（已知）， ∴AC∥ED﹙ ﹚ （2）∵∠2=﹙ ﹚（已知）， ∴AC∥ED﹙ ﹚ （3）∵∠A+﹙ ﹚=180°（已知）， ∴AB∥FD﹙ ﹚ （4）∵AB∥﹙ ﹚（已知）， ∴∠2+∠AED=180°﹙ ﹚ （5）∵AC∥﹙ ﹚（已知）， ∴∠C=∠1﹙ ﹚
【单选题】The reason why he adapted to the new situations quickly is that he has a _____ attitude.
A.
changeable
B.
alternate
C.
movable
D.
flexible
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