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1.The rating curve between the flux of the pulverized coal and the tob pressure and aperture of orifice-plate flow meter is a parabolic one.
煤粉流量与顶压及孔板直径成抛物线关系。收藏指正
2.Angle masters with various angles, prisms, corner cubes and lage aperture and high precision cemented plate.
不同角度的标准角块、棱镜、角反射器（角锥棱镜）及大口径、高精度的光胶板。收藏指正
3.An apparatus for taking photographs, generally consisting of a lightproof enclosure having an aperture with a shuttered lens through which the image of an object is focused and recorded on a photosensitive film or plate.
照相机一种用于拍摄照片的器械，一般由一遮光室组成，该遮光室带有一有层叠透镜的光圈，物体的影象通过它聚焦并被记录在一感光底片或感光板上收藏指正
4.In this paper, taking a system with a aperture of 1000, a primary mirror focal ratio of 3 and a Cassegrain focal ratio of 8 for an example, the author studied and designed four kinds of aspherical plate corrector for Quasi R-C, R-C, parabolical and spherical primary mirror Cassegrain Systems respectively.
本文通过口径为1000,主焦比为3,卡氏焦比为8的实例,对四种主要的卡氏系统:1.类R-C、2.R-C、3.抛物面主镜和4.球面主镜的卡氏系统,研究和设计了四种不同的非球面板改正器。收藏指正
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