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【单选题】
设随机变量X与Y 的相关系数为0.9,若Z=X-4,则Y与Z 的相关系数为 .(真题)A.
0.6
B.
0.7
C.
0.8
D.
0.9
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【单选题】Their profits have grown in recent years, and his upward ______ is expected to continue.
A.
action
B.
increase
C.
tendency
D.
movement
【单选题】成人脊椎结核和椎体肿瘤在X线上的主要鉴别点是观察
A.
椎体破坏的程度
B.
椎体破坏的数目
C.
椎旁软组织阴影的形态
D.
椎间隙是否变狭窄或消失
E.
椎体骨质疏松的程度
【简答题】Women’s roles have changed throughout the world in recent years, but nowhere so obviously as in America .As the roles of women have changed ,so have men’s .In many American homes today ,the husband st...
【单选题】成人脊椎结核和椎体肿瘤在x线上的主要鉴别点是观察
A.
椎体破坏的程度
B.
椎体破坏的数目
C.
椎旁软组织阴影的形态
D.
椎间隙是否变狭窄或消失
E.
椎体骨质疏松的程度
【单选题】In the past he was often ________, but in recent years he ________ his living by doing business with local traders. [ ]
A.
in debt; gained
B.
in debt; earned
C.
into debt; gained
D.
into debt; earned
【简答题】There have been some shocking cases of violent child abuse in Britain in recent years. To mention just two: Kristy Bamu was murdered in 2010 because his attackers thought he was a witch. He was 15. An...
【简答题】Family relations have changed in recent years in China, as we have more and more one-child families. The only child in the family becomes the center of attention and his wishes are always obeyed. The ...
【单选题】His books_popularity in recent years.
A.
has gained in
B.
have gained in
C.
has gained on
D.
have gained on
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