题目
A.f is a binary relationship from X to Y, but not a function from X to Y;
B.f is a function from X to Y, but it is not a full shot, nor is it a single shot;
C.f is a full shot from X to Y, but not a single shot;
D.f is a double shot from X to Y.
第1题
A.1
B.2
C.3
D.NULL
第2题
A.1
B.2
C.3
D.NULL
第3题
A.1
B.2
C.3
D.NULL
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