The line, at which the tooth intersects the graduated cylinder, is an arc in the developed surface of the cylinder.
轮齿与其分度圆柱面的交线在分度圆柱面所展开的矩形中为圆弧；
The bifurcated steel pipe is usually used int he hydro-engineering and other projects so that its developed surface is key to the design of project.
水利水电工程及其他工程中，经常使用钢岔管，岔管的展开是工程设计的一个重要课题。
The bifurcated steel pipe is usually used int he hydro-engineering and other projects so that its developed surface is key to the design of project.
水利水电工程及其他工程中，经常使用钢岔管，岔管的展开是工程设计的一个重要课题。
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