单选题
Suppose V
1
=＜R,+＞,V
2
=＜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 V
1
to V
2
B、
f is a surjective homomorphism from V
1
to V
2
C、
f is an isomorphism from V
1
to V
2
D、
none of the above
【正确答案】
A
【答案解析】
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