超音波法液位元元元元元元测定
ultra-sonic method of liquid meaduremert
单元节点号编宁不变性
invariance of nodenumbering sensitivity
单元节点拓扑阵
Element node topology matrix
六面体9节点单元
hexahedron element with 9 nodes
三角形六节点单元
triangular element with six nodes
超单元组合—超单元—单元划分
divition of “super unit combine—super unit—unit
单多点通信
Point-to-multipoint Communication
多sink节点布局
Multiple sink nodes’ deployment