题目3单选题
材料力学中,描述应力与应变关系的胡克定律表达式为( )A. <img src="https://tihai-oss-cloud.itihey.com/img/512566f440d0435e8482db55864b762e.png">B. <img src="https://tihai-oss-cloud.itihey.com/img/6495db2612b83c8ecd02fb1230460864.png">C. <img src="https://tihai-oss-cloud.itihey.com/img/74d15ebc08613e99a5f9a686a4086a7a.png">D. <img src="https://tihai-oss-cloud.itihey.com/img/237365b3f510e13505f3b93b862b8db4.png">