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【多选题】
Regarding data matrix and dissimilarity matrix, which of the followings are correct?A.
The size of a data matrix depends on the number of data objects and the number of attributes.
B.
The size of a dissimilarity matrix depends on the number of data objects, and is irrelevant to the number of attributes.
C.
Data matrices are symmetric.
D.
Dissimilarity matrices are symmetric.
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举一反三
【简答题】A．Saying goodbye to a friend. B．Buying a ticket for a sports . C．Paying a bill at the bank. D．Arranging a plane trip.
【单选题】They are ______ here ______ Shenzhen. Let's say goodbye to them. [ ]
A.
leaving; for
B.
leave; for
C.
to leave; to
D.
leaving; to
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