单项选择题
A.barplot(X)B.boxplot(X)C.pie(X)D.plot(X)
A.plot(x,y)B.bar(x)C.hist(x)D.pie(x)
A.eigen(A ,symmetric=T)B.solve(A)C.svd(A)D.qr(A)
A.read.table(“clipboard”,header =T)B.read.table(“textdata.txt”,header =T)C.read.table(“textdata.xlsx”,header =T)D.read.csv(“textdata.csv”,header =T)
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