某种证券j的风险溢价可表示为( )。? rm–rf;βj×(rm–rf)rf βj×(rm–rf)rj×rf 某种证券j的风险溢价可表示为( )。? rm–rf;βj×(rm–rf)rf βj×(rm–rf)rj×rf 发布时间:2025-07-06 18:39:35