单项选择题公式
的前束范式是( )。


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3.单项选择题对于一个只有4个不同元素的集合A来说,A上的不同的二元关系的总数为( )。

A.42
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7.单项选择题Suppose V1=<R,+>,V2=<R, ·>,where R is the set of real numbers, +and · are respectively addition and multiplication. Let f: R→R and {(x) = 10x, which of the following propositions is true ( )

A.f is an injective homomorphism from V1 to V2
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C.f is an isomorphism from V1 to V2
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