The utility model has various specifications according to the differences of the calibers of a smoke outlet of coal burning furnaces.
本设计新产品可据燃煤炉出烟口径不同有多种规格。
For fixing various aluminum caps as per minor calibers and different specifications.
根据不同规格得小口径，可以锁各种不同的铝盖。
The design of a big calibers concave mirror with the elliptical sphere surface
大口径椭球凹面取样镜设计
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