【简答题】A.essential B.elementary C.necessary D.principal
【单选题】要将某种配色方案应用到所有幻灯片,正确的操作是
【单选题】There is _______ wrong with your watch. Let me check it.
【单选题】The coefficient vector of the principal component expression is the eigenvector of _______________.
A.
the covariance matrix of original variables
B.
the covariance matrix of principal components