nominal focal ratio.
标称焦距比
The ratio of the focal length to the diameter of a lens system.
相机镜头直径焦距比。
This is the ratio of the focal length of the telescope to its aperture.
这是指望远镜的焦距与其孔径的比值。
The signal to noise ratio characteristics of focal plane array imaging system are also discussed in details.
同时详细讨论焦平面阵列成像系统的信噪比特性。
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