填空題在數(shù)據(jù)分組時(shí),數(shù)據(jù)源應(yīng)根據(jù)分組條件表達(dá)式創(chuàng)建索引,并且在報(bào)表的數(shù)據(jù) 環(huán)境中進(jìn)行設(shè)置設(shè)置()屬性.