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单项选择题
A.symmetry
B.antisymmetry
C.asymmetry
D.reflexivity
单项选择题
A.n
B.n-1
C.2n
D.n+1
单项选择题
A.只有Ⅰ
B.只有Ⅱ
C.Ⅰ和Ⅱ
D.Ⅰ、Ⅱ和Ⅲ
单项选择题
A.Ⅰ and Ⅱ
B.Ⅰ only
C.Ⅱ only
D.neither
单项选择题
A.f is an injective homomorphism from V1 to V2
B.f is a surjective homomorphism from V1 to V2
C.f is an isomorphism from V1 to V2
D.none of the above