较小的

Henan Seiko Machinery Co., Ltd., formerly known as China First Tractor Plant equipment, the early nineties the focus of development and production of waste powder Raymond Mill Series, Series beneficiation equipment, crushing equipment, stone cutting line and its ancillary equipment.

河南精工机械设备有限公司，前身为中国一拖配套设备厂，九十年代初重点开发生产废雷蒙磨粉机系列、系列选矿设备、破碎设备、石材切割系列及其附属设备。

Meanwhile, we show some links of Dickson polynomials and difference sets, including some interesting identities.

得到了超卵型线，2-1映射与差集的一些关系，同时，给出了Dickson多项式与差集的一些内在联系，得到了Dickson多项式的原像的一些有趣的等式。