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【判断题】
在进行趋势拟合时，我们希望误差项是一个白噪声序列，也就是不含什么信息的序列，从统计学的角度看，就是这个序列的均值为零，或者接近于零，它的方差为一个常数。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】“ 高脂、高能、高蛋白、低纤维”是下列哪种膳食结构的特点?
A.
植 物性食物为主的膳食结构
B.
动物性食物为主的膳食结构
C.
动植物食物平衡型膳食结构
D.
地中海型膳食结构
【单选题】How does the technical view of organizations fall short of understanding the full impacts of information systems in a firm?
A.
It sees information systems as a way to rearrange the inputs and outputs of the organization.
B.
It sees capital and labor as primary production factors.
C.
It sees the inputs and outputs, labor and capital, as being infinitely malleable.
D.
It sees the organization as a social structure similar to a machine.
【单选题】“ 高脂、高能、高蛋白、低纤维”是下列哪种膳食结构的特点?
A.
动植物食物平衡型膳食结构
B.
植物性食物为主的膳食结构
C.
动物性食物为主的膳食结构
D.
地中海型膳食结构
【单选题】How did the researchers ensu re that their findings are valid?
A.
By attaching equal importance to all possible variables examined.
B.
By collecting as many typical samples as were necessary.
C.
By preventing them from being affected by factors not under study.
D.
By focusing on the family background of children being studied.
【简答题】How does a firm ensure the responsibility to environment? Please give two examples.
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