(单选题)
相对于非概率抽样而言，概率抽样的特点不包括（ ）。
A.按一定的概率以随机抽样原则抽取样本
B.总体中每个单元被抽中的概率是已知的或可以计算出来
C.每个单位被抽入样本的概率相等
D.当采用样本对总体参数进行估计时，要考虑到每个样本单元被抽中的概率
参考答案：C
知识点：金融工具 金融 货币银行学 金融业务 模考估分
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