特发性血小板减少性紫癜最常见的死亡原因是（）

A.脑出血

B.心源性休克

C.胃肠道出血

D.骨髓机能不全

E.消耗性血液凝固病

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