题目内容

Most ductile materials are（）

A. Crack resistant
B. Crack propagate quickly
Crack is parallel to direction of applied stress
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 the above

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