第四章测试1. Which is not the characteristic of unloading （ ）
A:Elastic B:Parallel to the initial elastic loading line C:The slope is the modulus of elasticity D:Permanent deformation
答案:D
2. The characteristics of hysteresis loop are as follows （ ）
A:Area within hysteresis loop is energy per unit volume dissipated during a cycle B:Different strains, different hysteresis loops C:Progressive changes in the stress-strain behavior D:"Lag" phenomenon 3. The correct conclusions about data fitting are as follows （ ）
A:The stress and plastic strain amplitudes should be treated as independent variables B:Fatigue life as the dependent variable C:Inaccuracies in measuring small plastic strains at low loads can influence the test results D:Stress relaxation is different from cyclic softening 4. The rate or amount of relaxation depends on the magnitude of plastic strain amplitude. （ ）
A:对 B:错 5. Incremental-step test method: A series of specimens, each of which is subjected to a constant strain amplitude. （ ）
A:错 B:对
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