题目内容

Brittle materials have（）plastic deformation and low energy absorption before fracture

A. High
B. Low
C. Medium
D. None of the above

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Brittle materials have（）plastic deformation and low energy absorption before fracture

A. high
B. low
C. medium
D. none of above

Ductile materials have （） plastic deformation and energy absorption (“toughness”) before

A. racture
B. high
C. low
D. medium

Ductile materials have （） plastic deformation and energy absorption (“toughness”) before

A. Fracture
B. High
C. Low
D. Medium

两块平玻璃构成空气劈形膜,左边为棱边,用单色平行光垂直入射。若上面的平玻璃以棱边为轴,沿逆时针方向作微小转动,则干涉条纹 ( )

A. 间隔变小,并向棱边方向平移
B. 间隔变大,并向远离棱边方向平移
C. 间隔不变,向棱边方向平移
D. 间隔变小,并向远离棱边方向平移