There were bony defect and sclerosis on the vertebral body edge.
椎体后缘有骨性缺损，缺损边缘硬化。
When the defect of pile body is located at the range of one - dimensional blind areas, the wave form of the reflected wave distorts and shows the characteristics of strong amplitude and low frequency.
当桩身缺陷位于一维“盲区”范围时，反射波波形畸变，并呈强振幅，低频率之特征。
Slip line is a kind of surface defect which occurs in the forming of automobile panel and affects surface quality of automobile panel and appearance of body.
滑移线是汽车覆盖件冲压生产中经常出现的一种表面缺陷，它严重影响了覆盖件的表面质量和车身的外观。
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