题目内容

一般晶体中的扩散为( )。

A. 空位扩散
B. 间隙扩散
C. 环易位
D. 易位扩散

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在晶体中存在杂质时对扩散有重要的影响,主要是通过(),使得扩散系数增大。

A. 增加缺陷浓度
B. 使晶格发生畸变
C. 降低缺陷浓度

说明本征扩散与非本征扩散的区别;正常扩散与反常扩散(逆扩散)的区别,并举出逆扩散的例子。

Part I··Structure··(10 minutes)Directions: This part is to test your ability to construct grammatically correct sentences.It consists of 2sections.Section A21. I am interested in the training course, which ___________at Hilton Hotel in Beijing from March 8 to 12,2018.

A)held
B) was held
C)will hold
D) will be held

22. In his paper, John is trying to identify___________determines the final result of the project.

A)what
B)whether
C)when
D) how

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