题目
A.Y <- gl(3, 2, 6, labels = c(1, 2,3))
B.Y <- gl(3, 2, 6, labels = (1, 2,3))
C.Y <- gl(3, 2, 6, label = c(1, 2,3))
D.Y <- gl(1, 2, 3, labels = c(1, 2,3))
第2题
A.X<-seq[1:10]
B.X<-seq(1, by = 1, length.out = 1)
C.X<-seq(1, by = 10, length.out = 1)
D.X<-seq(1, by = 1, length.out = 10)
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