层合板壳单元
laminated plate-shell element
退化板壳单元
degenerated shell element
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
带肋板单元
the plate element with costalias
低阶薄板单元
low order thin plate element