一般在一个时点或时段上广泛地收集研究资料,并用以描述研究对象在这一时间点上的状况,或者探讨这一时间点上不同变量之间的关系的研究是( )
A.描述性研究
B.应用性研究
C.纵向研究
D.横向研究
正确答案是D
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