beam direction indicator
线束方向指示器
强制访问控制
射束方向指示器
射柱方向指示器
V-beam height indicator
long distance beam-beam interaction
beam camber [= camber of beam
beam to beam connection
beam to beam moment connection
beam width of Gaussian beam
Continuous beam turned from simple beam
continuous hollow slab beam erected as simple-supported beam in advance
Dual beam-focused ion beam