短語詞組短語beam -width effect 波束角傚應guidance beam -width 制導波束寬度beam s width 射線束寬度electron beam scanning width 束掃描寬度beam waist width 束腰寬度beam pulse width 束流脈沖寬度Constant beam -width beamformer 恒定束寬波束形成X -ray beam effective width 射束有傚寬度 返回 beam width