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

4.5 Diffusion between copper and nickel is a self-diffusion.

A. 对
B. 错