There are three classes of fits: 1) clearance fits, 2) transition fits (the assembly may have either clearance or interference), and 3) interference fits.
存在三种配合：1）间隙配合，2）过渡配合（装配后可以有 间隙或过盈），和3）过盈配合。
Fits can range from free running or sliding, where a certain amount of clearance, exists between mating parts, to press or interference fits where parts are forced together under pressure.
配合可分为结合件间有自由转动或滑动从而需要具有一定间隙量的间隙配合以及结合件需要紧密压靠一起 的压配合或过盈配合。
According to image plane interference status of optical aperture synthesis(OAS) and Huyges Fresnel theory, a mathematical method is set up which fits with the true condition.
从惠更斯—菲涅耳原理出发，根据光学综合成像像面干涉的实际情况，建立了符合实际的光学综合孔径像面干涉数学模型；
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