Grain boundaries are belonging to（）
A. Body Defects
B. Planar Defects
C. Line Defects
D. Point Defects
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Dislocation is belonging to（）
A. Body Defects
B. Planar Defects
C. Line Defects
D. Point Defects
According to the geometrical shape, crystal lattice imperfections are classified（）
A. Point Defects
B. Line Defects
C. Planar Defects
D. none of them
The property that describes a metal’s ability to resist surface wear and abrasion is（）
A. Fatigue strength
B. Hardness
C. Toughness
D. Tensile strength
What does summit of Kilimanjaro represent in the story（）
A. It is considered the place closest to God
B. It is named the House of God
C. It is seen as a place of spiritual transcendence
D. It is a sacred place
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