A.方差 B.協(xié)方差 C.相關(guān)系數(shù) D.標(biāo)準(zhǔn)差
A.規(guī)避風(fēng)險(xiǎn) B.減少風(fēng)險(xiǎn) C.轉(zhuǎn)移風(fēng)險(xiǎn) D.風(fēng)險(xiǎn)自擔(dān)
A.1 B.0 C.-1 D.任意數(shù)