3节点三角形膜单元
3-node triangular membrane element
6节点三角形单元
6-node triangular element
等角三角形命题
equiangular triangleproposition
等腰直角三角形波导
isosceles-right triangular waveguide
等腰直角三角形网
right-triangle irregular network
复数矢量三角形法
complex number vector tria ngle method
轨迹三角形法
Trajectory triangulation of lines
迹点三角形
triangle of disappearing lines
联系三角形法
connection triangle method