複選題7. Which one of the following types of stress-strain relationship best describes the behavior of most metals at room temperature: (A) elastic and perfectly plastic, (B) elastic and strain hardening, (C) perfectly elastic, (D) perfectly plastic (E) none of the above?

6. Which one of the following is the correct definition of ultimate tensile strength, as derived from the results of a tensile test on a metal specimen: (A) the stress encountered when the stress-strain curve transforms from elastic to plastic behavior, (B) the maximum load divided by the final area of the specimen, (C) the maximum load divided by the original area of the specimen, (D) the stress observed when the specimen finally fails (E) none of the above?

複選題
7. Which one of the following types of stress-strain relationship best describes the behavior of most metals at room temperature:
(A) elastic and perfectly plastic,
(B) elastic and strain hardening,
(C) perfectly elastic,
(D) perfectly plastic
(E) none of the above?

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