half-amplitude beam半幅射束
half-beam technique半束照射技术
half-beam irradiation半束照射
half-peak beam angle半峰光束角
half-power beam width半功率点波束宽度;半功率波宽;半功率角;半功率射线束宽度
half-intensity beam angle发光二极管的半强度角
half-power beam-width半功率波束
half-width of beam waveform束流波形半宽度
beam half-angle束半张角