黄土堆积的总厚度在地域上有明显的变化，陇东、陕北、晋西是黄土分布的中心区。
The aggregate thickness of loess has a clear regional variation with the east of Gansu, the north of Shannxi, the east of Shanxi being the center regions.
接着研究了两种充磁方式，不同气隙下气隙总磁通随极对数和磁钢厚度的变化规律。
The principles of the total air gap flux varied with the pole number and thickness of magnet are analyzed by two different magnetizations in both external and internal fields.
煤层厚度变化较大，总的规律是东厚西薄，局部分叉尖灭。
Generally it is thicker in the east-ern part, than in the western part and local offset and thin out.
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