Many good friends have a lot in _______.
A、similarity
B、difference
C、common
D、usual
第1题:
A、have…flowing
B、have…flow
C、have…to flow
D、have…flowed
第2题:
What operation on relations R and S produces the relation shown below?
A.Union
B.Difference
C.Intersection
D.Division
第3题:
第4题:
A. many - to - one
B. one - to - one
C. one - to - many
D. many - to - many
第5题: