基本解釋銷量差異 銷貨數(shù)量差異詞組短語短語sales margin volume variance 銷售差益業(yè)務(wù)量差異final sales volume variance 數(shù)量差異sales volume variance更多詞組專業(yè)釋義經(jīng)濟(jì)學(xué)銷量差異