题目内容

( ) and Interstitial are the two types of point defect.

A. Dislocation
B. Voids
C. Vacancy
D. Twin interface

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______ materials have order only within a few atomic or molecular dimensions.

Solid materials can be classified into the following types ( )

Amorphous
B. Polycrystalline
C. Single crystal
D. Mixed crystal

( ) is a combination of all symmetry elements in the internal structure of the crystal, specifically a combination of all symmetry elements in the unit cell.

A. Space group
B. Crystal classes
Crystal system
D. Crystal family

______ materials compose of multiple ordered regions, which are separated from one another by grain boundaries.