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有关系R和S,与RS等价的差运算表达式为____

高老师2年前 (2024-03-27)数据库及其应用(02120)7

有关系R和S,与RS等价的差运算表达式为____

R-(R-S)

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There are several common features-which would apply to metals and minerals, just as much as to soft commodities. Investment funds have moved out of commodities which were bought in the 1970s as store of value and into more liquid