After built the material's defect model in theory, combined the attenuation image and damage mechanics of acoustic, we can get the material's invalidation model.
从理论上建立材料的缺陷模型，并结合声衰减分布图与超声损伤力学原理，就能获得材料的失效模型。
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Result: 50 cystic renal cell carcinoma patients confirmed by pathology after operations have certain features in the performances of two-dimensional acousticimage and color Doppler ultrasonic.