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【单选题】
在回归分析中,残差平方和是指A.
各实际观测值 与其均值 的离差平方和
B.
各实际观测值 与回归值 的离差平方和
C.
回归预测值 与因变量均值 的离差平方和
D.
因变量 与自变量 的平方和
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举一反三
【单选题】Positive nitrogen balance is seen in
A.
Starvation
B.
Wasting diseases
C.
Intestinal malabsorption
D.
Growing age
【单选题】The gaseous oxides of nitrogen have positive enthalpy changes of formation.Which factor is likely to make the most significant contribution to these enthalpy changes?
A.
the high bond energy of the nitrogen molecule, N2
B.
the high electron affinity of nitrogen atoms
C.
the high electron affinity of oxygen atoms
D.
the similarity of the electronegativities of oxygen and nitrogen
【单选题】According to Confucius, _____ would be considered to be filial.
A.
to provide enough food to parents
B.
to let parents travel around the world
C.
to give parents a lot of money
D.
to provide parents with enough food and show respect to them as well
【单选题】Cancer should be considered to be a biological problem rather than a medical one because ______.
A.
viruses are known to cause cancer in animals
B.
at present, human cancer is not believed to be contagious (传染的)
C.
there are many known causes for the transformation of a normal cell to a cancer cell
D.
results of experiments on plants and animals do not vary greatly from species tn species
【单选题】Which of the following state is positive nitrogen balance?
A.
advanced cancer
B.
pregnant women
C.
people suffer from fever
D.
people suffer form long-time hunger
E.
normal adult
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