有值3,5,5,7的整数向量 an integer vector with the values 3, 5, 5, 7.
C.
有值1,2,5,7的数字向量 a numeric vector with the values 1, 2, 5, 7.
D.
有值3,5,5,7的数字向量 an numeric vector with the values 3, 5, 5, 7.
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