随机化
答:是指随机取样(1分)和随机分组(1分),即从目标人群中随机地选择样本(1分)并将这些被选到的研究对象随机地分到实验组和对照组中(1分)。
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Complete the following sentence with a (compound) word derived from the one(s) given in bracket.
He had a headache and had to take some ( )(pain, kill)
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