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套利定價理論(APT)是根據下列何種觀念?(A)風險不同的證券，其期望報酬率也可能相同(B)風險完全相同的證券，其期望報酬率也應該相同(C)不同種類的證券，即使其風險完全相同，其期望報酬率也不會相同(D)選項ABC皆是

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