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【单选题】
当样本容量很大时,以下关于抽样分布的表述正确的时( )
A.
形状、均值、标准差与总体相同
B.
服从正态分布,且均值、标准差与总体相同
C.
形状、均值与总体相同,但标准差变小
D.
服从正态分布,且均值与总体相同,但标准差变小
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举一反三
【单选题】Twenty-five students wererandomly selected from each ethnic group.
A.
problem
B.
research questions
C.
hypothesis
D.
procedure
E.
findings
F.
conclusion
【单选题】—How about going out for a picnic on Sunday morning? —Hmm.___.The weather is very good these days.
A.
Yes, why not
B.
Well, no way
C.
Oh, never mind
D.
Sure, no matter
【单选题】The _______ of students in our class are from the country; only five are from cities.
A.
most
B.
majority
C.
minority
D.
mostly
【单选题】Twenty-five students wererandomly selected from each ethnic group.
A.
P -- Problem
B.
Q -- research questions
C.
H -- hypothesis
D.
PR -- procedure
E.
F -- findings
F.
C -- Conclusion
【单选题】我国第一部文人词集是()
A.
花间集
B.
云瑶集
C.
云间集
D.
珠玉集
【简答题】我国第一部文人词集是( )。
【简答题】( )是仿生形态最基本、最微观的部分。是对生物体和自然界物质存在的内部结构原理的模仿。
【简答题】完形填空。 In some areas of the world the weather is very 1_____ and this fact plays an important part in the daily lives of the people. 2_____ they are farmers, fishermen, or sailors, for instance, they 3...
【简答题】微血管病性溶血性贫血的发病机制主要与下列哪项因素有关? A.微血管内皮细胞大量受损 B.纤维蛋白丝在微血管腔内形成细网 C.血小板的损伤 D.小血管内血流淤滞 E.白细胞的破坏作用
【单选题】Now_____is late autumn and the weather is very cool.
A.
that
B.
it
C.
this
D.
one
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