超音波法液位元元元元元元测定
ultra-sonic method of liquid meaduremert
四元素边值问题
boundary value problem of quaternion numbers
边界元素法
Boundary element method
7-hydroxy-4’-methyl-isoflavone
sound absorption coefficient
薄层元素法
thin layered element method
掺杂合金元素法
doping alloying elements method
等效元素法
equivalent finite element