focal ratio
美 [ˈfoʊkl ˈreɪʃioʊ]英 [ˈfəʊkl ˈreɪʃiəʊ]
- 网络焦距比;焦比大
focal ratio-
The focal ratio of the Cassegrain system for the telescope is F / 10 and the plate scale is 20 ″ / mm .
该望远镜卡焦焦比为F/10，底片比例尺为20〃/mm，无畸变象场约为1平方度天区。
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Study of the Tests of Large-aperture and Fast Focal Ratio Convex Hyperboloid Mirrors with a " Stitching " Method
大口径快焦比凸双曲面拼接检测方法研究
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Focal point at the ratio of transmission calculating , every gear wheel torsion of the differential gear wheel system distributing and the Accident analysis and scheme of transforming for the stretcher straightener , We have carried on the detailed discussion to study .
本文重点拉弯矫正机差速器传动系统的对传动比及效率计算、差速齿轮系统各齿轮扭矩分配、齿轮承载能力计算，气垫炉拉弯矫正机设备故障分析及改造方案进行了详细的讨论研究。