查询词典 focal ratio
- 与 focal ratio 相关的网络解释 [注：此内容来源于网络，仅供参考]
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clearance between focal point and (plate) surface：离焦量
焦斑直径focussed diameter of the beam | 离焦量clearance between focal point and (plate) surface | 焊缝深宽比weld seam depth-to-width ratio
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focusing screen：对焦屏
一架理想的天文摄影用的单镜反光机,其对焦屏(Focusing screen)最好能够更换. 普通单镜反光机所配备的微梭镜(Micro-prism)或裂像(Split-image)对焦屏在放大摄影一般运用的有效光圈范围(Effective focal ratio,通常由直接焦点的 / 6左右至高倍放大时的 / 100以上),
- 推荐网络解释
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McKenna：麦肯纳(姓氏)
officers n.政府官员, 军官, 警官, 船长vt.指挥 | mckenna 麦肯纳(姓氏) | disappointing adj.使人失望的, 令人失望的
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rapid：激流
他们穿过很多美丽的峡谷,绕过无数大瀑布(cataract)、激流(rapid)和瀑布(waterfall). 带着仅有的两艘船,和几乎完全耗尽的给养,剩余的六个人终于到达了维尔京河(Virgin)的摩门教定居点. 这里,是他们一百天探险的终点.
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to walk over the potholes and tell me that：還會說
雨天散步他會背我過積水, When it is raining,he'd carry me on his back, | 還會說, to walk over the potholes and tell me that | '你可以再胖一點~' 'You should put on more weight.'