Formation of powdery stone and its properties are introduced. Parameters for design and construction of cushion are acquired after investigated the mechanical characteristics of powdery stone cushion.
本文介绍了石粉的形成和材料的特性，对石粉垫层的力学特征作了研究，取得了垫层的设计与施工参数。
With gasketed connections, the material of construction of the washer is important, both for compatibility with the gases in use and for its mechanical properties.
对于衬垫接头，垫圈的结构材料对于使用的气体的相容性和垫圈的机械性能都是很重要的。
This paper shows the construction of hydrodynamic oil seal SR. and discusses its properties and service life through test.
本文介绍“SR”流体动力油封的结构，通过试验更进一步论述“SR”流体动力油封的密封性能和使用寿命。
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