新托福考试必备词汇记忆20
beam deflecting crystal 偏束晶体，光束偏转晶体beam deflecting mirror 射束偏转镜
beam deflection 束偏斜
beam deflection tube 束偏斜管
beam density 射束密度
beam deviation factor 射束偏移系数
beam diameter 束直径
beam displacement 束位移
beam divergence angle 束发散角
beam divider 析光镜，分束器
beam expander 束扩展器
beam flying 光束扫描
beam focusing (1)电子束聚焦(2)射线束聚焦
beam forming 聚束
beam forming optics 聚束光学系统
beam guidance 光束制导
beam intensity 光束强度
beam locking 射束锁定
beam of light 光束
beam of X-raysX 射线束
beam optics 束流光学
beam path 光路，光束路径
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