共轭曲线

During the investigations, some basic research methods and theories such as mending the end section profile of the screw arbor gear applying the conjugate principle, the milling outline for the screw arbor profile cutter by kineto-synthesis method, establishing the dummy variable model of the screw arbor by the CAD method, the theory of the distributing of the fluid pressure on the screw, the precision analyzing and computing screw profile by the dummy model and FEM method are established.

在研究过程中确立了一些基本的研究方法和基本的理论。如应用共轭原理改进螺杆端截面齿曲线的、利用运动合成的方法研究螺杆成形铣刀廓型、应用计算机辅助设计的方法建立螺杆的虚拟模型、应用牛顿流体理论研究螺杆中的流体压力分布、应用有限元分析计算方法对螺杆做精确分析计算。

Bights of screw tread components adopt advanced CAD, and belong to knead conjugated model, possessing outstanding function of self-cleaning and favorable exchangeability. There exists wide variety of kinds.

螺纹元件的曲线采用先进的电脑辅助设计，成为捏合共轭型，具有优异的自洁功能和良好的互换性。

Bights of screw tread components adopt advanced CAD, and belong to knead conjugated model, possessing outstanding function of self-cleaning and favorable exchangeability. There exists wide variety of kinds.

螺纹元件的曲线采用先进的计算机辅助设计，成为捏合共轭型，具有优异的自洁功能和良好的互换性。

The article uses the theory of projective geometry to determine the polar and pole of self-conjugate of nonsingular conic without thinking about measure.

用射影几何的理论，抛开度量性质，给出了非退化二次曲线自共轭的极线与极点的射影定位，为现代设计提供了理论依据。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。