题目内容：
马科维茨指出，在同一期望收益前提下，最为有效的投资组合是（ ）。
A.高收益 B.低收益 C.高风险 D.低风险
参考答案：
答案解析：
选择题：马科维茨指出，在同一期望收益前提下，最为有效的投资组合是（ ）。A.高收益 B.低收益 C.高风险 D.低风险
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