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【判断题】
HSV色彩模型是从RGB色彩模型白色定点垂直看过去,所形成的每一个六边形横截面所组成的六角圆锥体A.
正确
B.
错误
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举一反三
【单选题】When we categorize fruits into spring fruits, summar fruits, fall fruits and winter fruits, we're dividing them based on ( ).
A.
Season
B.
Alphabet
C.
Location
D.
Meaning
【单选题】Lady Wang _____as a secretary for five years in the company, and now she is a general manager of it.
A.
has served
B.
serves
C.
had been serving
D.
served
【简答题】Directions:Read the text below. Write an essay about 120 words, in which you should summarize the key points of the text and make comments on them. Try to use your own words. It seems the nation’s you...
【简答题】“I’m sy years old,” says the gray-haired lady proudly to the entertainer at her Community Club dinner. “Did you hear that, everyone?” says the entertainer. “This lovely lady is just sy years...
【单选题】对于抽样误差,下面正确的说法是( )。 A 抽样误差是随机变量; B 抽样平均误差是一系列抽样指标的标准差; C 抽样误差是估计值与总体参数之间的最大绝对误差; D 抽样误差是违反随机原则而产生的偏差; E 抽样平均误差其值越小,表明估计的精度越高。
A.
ABD
B.
DE
C.
ABC
D.
ABE
【单选题】有关抽样误差的叙述，不正确的是
A.
抽样误差是由随机抽样而造成的
B.
抽样误差的存在是不可避免的
C.
抽样误差可通过科学地调查研究设计加以控制
D.
抽样误差可应用统计学方法加以估计
E.
抽样误差最常用的指标是标准差
【简答题】阅读短文，判断正(T)误(F)。 I have been a news reporter for the past fif years. The job has taught me many unforgettable lessons. I have seen wars, poverty and death, but I have also seen courage (勇气), hope ...
【简答题】抽样误差是指随机抽样调查中()与()之间的差异。
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