超音波法液位元元元元元元测定
ultra-sonic method of liquid meaduremert
超单元组合—超单元—单元划分
divition of “super unit combine—super unit—unit
半正定自共轭四元数矩阵
positive semidefinite self-Conjugate matrices of quaternions
部分等距四元数矩阵
partial isometry matrix of quaternions
二级双四元数
second order duoquaternion