vertebral compression fracture1.gif
![the role of acoustic emission in the study of rock fracture[j].](http://i.handsetwalls.com/uploads/i_0_2146446221x3239363621_253.jpg)
the role of acoustic emission in the study of rock fracture[j].
ppt 57页
of 86 cases of compression fracture of thoracolumbar vertebra
外文翻译--制造业用于提高表面光洁度和减少切削力的
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