某研究者计划从2000人中抽取200人作为样本,他按抽样比率为k = 2000/200 = 10,随机 选出ー个少于10的数,每隔10人选ー个,直到选够200人为止,这种抽样方法是
A.简单随机抽样
B.系统随机抽样
C.分层随机抽样
D.整群抽样
正确答案是B
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