1、判断题:
Stress state softness coefficient can be defined as the ratio of maximum normal stress to maximum shearstress.( )
选项:
A:错
B:对
答案: 【错】
2、判断题:
Only brittle materials have compressive strength.( )
选项:
A:错
B:对
答案: 【对】
3、判断题:
The deformation of plastic material is much larger than that of brittle material,its plastic is better.( )
选项:
A:错
B:对
答案: 【对】
4、判断题:
Brittle materials of compression test is cut along the axis at 60°.( )
选项:
A:错
B:对
答案: 【错】
5、单选题:
The compressive strength of brittle materials is generally ( ) than its tensile strength.。
选项:
A:equal
B:higher
C:lower
答案: 【lower】
6、判断题:
The torsion test fracture surface of the plastic material is perpendicular to the axis of the sample, and the fracture is coarse.( )
选项:
A:对
B:错
答案: 【错】
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