不同于其他IT架构，SOA要求不同的服务水平管理，原因在于服务的粒度比应用的粒度更细。

SOA requires different service level management than other it architectures, because of the finer granularity of services, compared to applications.

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这是因为乙炔黑的粒度比石墨小，比表面积相对更大，能很好地分散在活性物质之间。

It is because that the particle size of acetylene black is smaller than that of graphite, it is easy to disperse well among active material.

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薄板坯的晶粒度的大致范围在4～5级，其中在厚度方向上薄板坯中心部位晶粒度比侧部小半个等级。

The grain size grade is about 4-5 class, and that during the thickness the central is less half a class than the lateral.

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