The (graphite) crystallites in the outer layer of the carbon fibers are large with few pores, while the inner crystallites are small with many pores.
原丝经过预氧化后仍保持原来的微原纤结构，纤维外部表层的石墨微晶较大，所含孔隙较少，内部的微晶较小且含有大量孔隙。
Because of its small screening radius and short delay time, graphite is chosen as the cathode material.
在电子束产生过程中，屏蔽半径应尽可能地小，且击穿延时时间较短，故选择石墨作为阴极材料。
Such small tolerances require careful design and machining of the graphite boat and slider so that the sliding motion is smooth and without jitter.
这样小的公差要求仔细设计和精心加工石墨舟皿和滑动器，从而使滑动器的滑动平滑而没有跳动。
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