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某股票的貝它（Beta）值等於0.9，表示：(A) 該股票的期望報酬率應為市場的0.9倍(B) 該股票價格的波動率為市場的0.9倍(C) 該股票報酬率與市場報酬率相關係數為0.9(D) 該股票報酬率受總體經濟因素之影響程度為市場的0.9倍

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