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A.xA∩B B.xA或xB
C.xA且xB D.xA∪B
A.xA且xB B.xA或xB
C.xA∩B D.x∈A∩B
A.xA且xB B.xA或xB
C.xA∩B D.x∈A∩B
若命题P:x∈AB,则“P”是
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