一道关于材料学的题目 急啊Derive linear density expressions for the [100] and [111] directions for an FCCcrystal structure. The linear density might be considered as the fraction of thedirection vector covered by atoms whose centres lie on

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一道关于材料学的题目 急啊
Derive linear density expressions for the [100] and [111] directions for an FCC
crystal structure. The linear density might be considered as the fraction of the
direction vector covered by atoms whose centres lie on the direction vector.

LZ想问什么?翻译的话再下面.= =!(并非自己翻译的..)
线性密度表达式推导[100]和[111]方向为FCC晶体结构.线性密度的分数可能被视为受原子的中心方向向量谎言的方向向量.