微区面分布的元素成像分析
micro-area elemental distribution image analysis (image-XRF
超音波法液位元元元元元元测定
ultra-sonic method of liquid meaduremert
分散元素成矿规律
regularity of disperse emement concentration
合金元素成分起伏
alloy element composition fluctuation
建筑构成元素
Architectural composite element