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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
单项选择题
A.10
B.0
C.1
D.none of the above
单项选择题
A.仅Ⅲ
B.Ⅰ和Ⅱ
C.Ⅰ和Ⅲ
D.都不对