若关系R和S分别包含r和s个属性,分别含有m和n个元组,则R×S
A.包含r+s个属性和m+n个元组
B.包含r+s个属性和m×n个元组
C.包含r×s个属性和m+n个元组
D.包含r×s个属性和m×n个元组
正确答案是B
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