问题
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
答案
参考答案：A