短語(yǔ)詞組短語(yǔ)principal l element 主要因素principal idempotent element 主冪等元principal nilpotent element [數(shù)]主冪零元素refined principal -element analysis model 改進(jìn)型主成分分析模型principal element analysis 主元分析The principal element 主元AlTiFeNiCuCr multi -principal element alloy AlTiFeNiCuCr多主元郃金 返回 principal element