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【判断题】
张节理往往呈X形两组分布,张节理面比剪节理面光滑:A.
正确
B.
错误
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【简答题】Birds are sometimes referred to as glorified reptiles. And even though modern birds are structurally very different from 1 , some show minor evidence of their 2 , like scales on their feet or claws on...
【多选题】以下关于积矩相关系数（用r表示）的说法正确的有（ ）。A． B． 当|r|=0时，表示两指标变量完全线性相关 C． 0D． 0．8
A.
A
B.
B
C.
C
D.
D
【多选题】An introductory sentence for a brief summary of the passage is provided below. Complete the summary by selecting the THREE answer choices that express important ideas in the passage. Some sentences do...
A.
The core knowledge perspective ignores the value of sensorimotor activity in infant development.
B.
There is disagreement among researchers over the nature of the innate cognitive ability infants have.
C.
Infants are exposed to and must respond to many different types of stimulation as they develop.
D.
Core knowledge theorists believe that babies could not develop as quickly as they do without innate knowledge systems that allow them to understand the world.
E.
Numerical knowledge is the earliest of several types of knowledge systems to develop in infants.
F.
There are several types of knowledge systems that infants seem to possess.
【多选题】下列有关相关系数r的叙述，正确的是( )
A.
是介于0～±1之间的相对数值
B.
当r=1，表示直线与y轴平行
C.
当r＝1，表示直线与x轴平行
D.
当r＞0时为正相关
E.
当r＜0时为负相关
【单选题】下列关于相关系数r的说法，正确的是（ ）。
A.
当1，1=1时，表示两个指标变量不存性相关
B.
当|r|=0时，表示两个指标变量完全线性相关
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