增益率的表达式是Gain_ratio(D,a)=___
AGain(D,a)+IV(a)
BGain(D,a)-IV(a)
CGain(D,a)*IV(a)
DGain(D,a)/IV(a)
增益率的表达式是Gain_ratio(D,a)=___
AGain(D,a)+IV(a)
BGain(D,a)-IV(a)
CGain(D,a)*IV(a)
DGain(D,a)/IV(a)
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