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A.預(yù)期收益率期望值大,標(biāo)準(zhǔn)差大B.預(yù)期收益率期望值小,標(biāo)準(zhǔn)差小C.預(yù)期收益率期望值大,標(biāo)準(zhǔn)差小D.預(yù)期收益率期望值小,標(biāo)準(zhǔn)差大