短語詞組短語harmonic average index number 調(diào)和平均指數(shù)weighted harmonic average price 加權調(diào)和平均價格harmonic average particle diameter 調(diào)和平均粒徑weighted harmonic average price index 加權調(diào)和平均價格指數(shù)average harmonic mean 調(diào)和平均 返回 harmonic average