1. Multiple choice questions (only one correct answer for each question below): (30%)
 (1) Which one of the following types of stress–strain relationship best describes the behavior of brittle materials such as ceramics and thermosetting plastics:
(A) elastic and perfectly plastic,
(B) elastic and strain hardening,
(C) perfectly elastic,
(D) none of the above.

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統計： A(0), B(1), C(0), D(0), E(0) #2796227