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