实验性研究和非实验性研究的根本区别在于( )
A.是否设立对照组
B.是否有干扰因素
C.是否随机抽样
D.有无干预
正确答案是D
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
Upon graduation from university, he was assigned to work as Professor Stevenson’s ( ). (assist)