短語詞組短語base -period weight index 基期加權(quán)指數(shù)fixed base period 固定基期;固定基期英語base period weight index [統(tǒng)計]基期加權(quán)指數(shù);基期權(quán)數(shù)指數(shù)base period productivity 基期產(chǎn)量chain base period [統(tǒng)計]環(huán)比基數(shù)selection of base period 基期選擇shifting the base period 改換基期 返回 base period