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【单选题】
下列由中心极限定理得到的有关结论中,正确的是( )。
A.
只有当总体服从正态分布时,样本均值才会趋于正态分布
B.
只要样本容量n充分大,随机事件出现的频率就等于其概率
C.
无论样本容量n如何,二项分布概率都可以用正态分布近似计算
D.
不论总体服从何种分布,只要样本容量n充分大,样本均值趋于正态分布
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举一反三
【单选题】How are children in the Nursery conditioned to dislike books and flowers?
A.
By preventing the children from ever seeing books or flowers
B.
By using hypnopaedia to teach them that books and flowers are worthless
C.
By spanking the children when they approach books or flowers
D.
By sounding alarms and shocking the children when they approach books or flowers
【判断题】所有的数据流图都可以看作变换型数据流图。
A.
正确
B.
错误
【单选题】我们常用的VCD、DVD采用的视频压缩编码国际标准是()
A.
PAL
B.
NTSC
C.
MPEG
D.
JPEG
【单选题】我们常用的VCD、DVD采用的视频压缩编码国际标准是( )。
A.
PAL
B.
NTSC
C.
JPEG
D.
MPEG
【单选题】Children are quick to decide whether they like or dislike a book.
A.
Wendy Cooling
B.
David Almond
C.
Julia Eccleshare
D.
Jacqueline Wilson
E.
Anne Fine
【判断题】Children dislike obeying instructions in the speaker's view
A.
正确
B.
错误
【单选题】Soda tax will lead to decrease in______.
A.
soda drinking
B.
calorie in—take
C.
children obesity rate
D.
employment rate
【判断题】所有的数据流图都可以看作变换型数据流图。
A.
正确
B.
错误
【单选题】橡皮树的主要繁殖方法是( )
A.
分株
B.
分球
C.
播种
D.
扦插
【单选题】Why do the speaker's children dislike eating in restaurants?
A.
Because the food is not delicious.
B.
Because they have to be quiet for a long time.
C.
Because the food is not enough.
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