Which of the following are the properties of crystals（）
A. long-range order
B. have fixed melting points
C. anisotropic各向异性
D. short-range order
E. isotropic各向同性
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Which of the following are the methods of getting fine grains（）
A. Increase the degree of supercooling
B. Inoculation
C. Vibration and stirring
D. Reduce the degree of supercooling
Dislocation（位错） is belonging to（）
A. Body Defects
B. Planar Defects
C. Line Defects
D. Point Defects
The lattice of solid solution is the same as（）
A. solution
B. solvent
C. solute
D. solute or solvent
Grain boundaries are belonging to（）
A. Body Defects
B. Planar Defects
C. Line Defects
D. Point Defects
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