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【单选题】
The dislocation line of is a straight line.
A.
edge dislocation
B.
mixed dislocation
C.
screw dislocation
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参考答案：
举一反三
【单选题】The Burgers vector of edge dislocation is perpendicular to its dislocation line, and Burgers vector of screw dislocation is parallel to its dislocation line.
A.
Wrong
B.
Correct
【单选题】In the following defect structures, which one does not belong to point defects:
A.
Interstitial atom
B.
Edge dislocation
C.
Vacancy
D.
Frackel defect
【单选题】The negative sign in the First law of diffusion denotes ( ).
A.
The diffusion direction is opposite to the concentration gradient.
B.
The direction of diffusion is the same as that of concentration gradient.
C.
The diffusion direction is independent of the concentration gradient.
D.
The diffusion flux is negative.
【单选题】The upper part of the crystal above the slip plane of positive edge dislocation is under compressive stress and the lower part is under tensile stress.
A.
Wrong
B.
Correct
【单选题】The diffusion is always the migration of material from high concentration to low concentration.
A.
Incorrect
B.
Correct
【单选题】In the nonsteady diffusion, the concentration gradient dependens on the time.
A.
Incorrect
B.
Correct
【单选题】( ) is the most important diffusion mechanism in interstitial solid solution.
A.
Interstitial diffusion
B.
Short-circuit diffusion
C.
Exchanging mechanism
D.
Vacancy mechanism
【单选题】In the Kirkendall effect, the main reason for the drift of marking surface is due to ( ) in the diffusion couple.
A.
the different diffusion rates of the two components
B.
the different atomic sizes of the two components
C.
the diffusion of only one component
【单选题】The direction of screw dislocation motion is generally .
A.
the direction of crystal slipping
B.
perpendicular to dislocation line
C.
parallel to dislocation line
【单选题】The shear stress acting on the dislocation drives the slip. The stress is .
A.
the shear stress resolved within the slip plane and direction
B.
the external shear stress
C.
the shear stress resolved within the moving direction of the dislocation line
相关题目：
【单选题】The Burgers vector of edge dislocation is perpendicular to its dislocation line, and Burgers vector of screw dislocation is parallel to its dislocation line.
A.
Wrong
B.
Correct
【单选题】In the following defect structures, which one does not belong to point defects:
A.
Interstitial atom
B.
Edge dislocation
C.
Vacancy
D.
Frackel defect
【单选题】The negative sign in the First law of diffusion denotes ( ).
A.
The diffusion direction is opposite to the concentration gradient.
B.
The direction of diffusion is the same as that of concentration gradient.
C.
The diffusion direction is independent of the concentration gradient.
D.
The diffusion flux is negative.
【单选题】The upper part of the crystal above the slip plane of positive edge dislocation is under compressive stress and the lower part is under tensile stress.
A.
Wrong
B.
Correct
【单选题】The diffusion is always the migration of material from high concentration to low concentration.
A.
Incorrect
B.
Correct
【单选题】In the nonsteady diffusion, the concentration gradient dependens on the time.
A.
Incorrect
B.
Correct
【单选题】( ) is the most important diffusion mechanism in interstitial solid solution.
A.
Interstitial diffusion
B.
Short-circuit diffusion
C.
Exchanging mechanism
D.
Vacancy mechanism
【单选题】In the Kirkendall effect, the main reason for the drift of marking surface is due to ( ) in the diffusion couple.
A.
the different diffusion rates of the two components
B.
the different atomic sizes of the two components
C.
the diffusion of only one component
【单选题】The direction of screw dislocation motion is generally .
A.
the direction of crystal slipping
B.
perpendicular to dislocation line
C.
parallel to dislocation line
【单选题】The shear stress acting on the dislocation drives the slip. The stress is .
A.
the shear stress resolved within the slip plane and direction
B.
the external shear stress
C.
the shear stress resolved within the moving direction of the dislocation line
参考解析：
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