结果：MRI可详细了解脊髓圆锥的位置、终丝、椎管内外脂肪瘤、脊髓脊膜以及脊柱等的各种病理变化。

Result:MRI could find the level of conus tip and the pathological changes of filum, terminus, spinal lipoma, spinal cord and spinal column.

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介绍了电参数如频率、占空比、电流密度、终电压等的概念，推导了占空比与电流密度的关系，并综述了电参数对阳极氧化膜性能影响的研究进展。

Concepts of some electric parameters such as frequency, duty cycle, current density and final voltage were introduced and the relation between duty cycle and current density was deduced.

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