一般来说，喷涂底漆多选用大口径喷枪，喷涂中间涂层时选用中口径喷枪，喷涂面漆时多选用小口径喷枪。
In general, more choice of large caliber gun spraying paint, spraying coating used in intermediate caliber gun, small caliber gun with spray paint.
叙述一种用于测试大口径、长焦距光学系统杂光系数、渐晕系数、像面照度均匀性等光学参数的检测方法。
A method is introduced for testing stray light coefficient, vignetting coefficient and image surface uniformity optical system with large aperture and long focal length.
大口径望远镜主镜的面形精度是影响望远镜成像质量的关键因素之一。
The surface figure precision of the primary mirror in a large aperture telescope is a key factor influencing the imaging quality.
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