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A.X B.T C.Φ D.S
A.S B.T C. D.Z
设S、T为非空集合,且ST,TS,令X=S∩T,则S∪X=
设S,T是两个集合,且ST,TS,若M=S∩T,则S∪M等于( )?
A. B.S
C.T D.M?