单项选择题

When the adjacency matrix method is used to store a graph, which of the statements is (are) true ( )

A．Ⅰ and Ⅱ
B．Ⅰ only
C．Ⅱ only
D．neither
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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
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
P(n) is the predicate if 2 can'nt divides n 4 can'nt divides n then 8 divides n. What is the truth value of P(12) ( )
A．10
B．0
C．1
D．none of the above
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