题目内容

3.4What is the closest packing which can be achieved in a plane?

A cubic array
B. A Hexagonal array
C. A random array
D. None of the above

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4.1 How many kinds of ponit defects have been mentioned in Lecture 4? What are they?

4.2 What is the relationship of the Burgers vetor and the edge dislocation line?

A. Parallel
B. Perpendicular

4.3What is the relationship of the Burgers vector and the screw dislocation line?

A. Parallel
B. Perpendicular

4.4 Which two choices are the diffusion mechanisms?

A. vacancy diffusion
B. self-diffusion
C. interdiffusion
D. Interstitial Diffusion