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【多选题】
关于操作定义的作用,正确的理解是()
A.
有利于提高研究的客观性
B.
有助于研究假设的检验
C.
说明了测量变量、概念或指标的操作方法
D.
利于研究结果的评估与检验
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D.
李隆基
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A.
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B.
错误
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A.
because of
B.
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C.
in the interests of
D.
in face of
【简答题】To us it seems so natural to put up an umbrella to keep the water off when it rains, but actually the umbrella was not invented as protection against the rain, Its first use was as a shade against the...
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A.
that
B.
where
C.
which
D.
when
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A.
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