查询词典 datum

An initial surface is determinated firstly, which is used as the datum plane to parameterize the discrete boundary points, and then an object function is established by the control points of B-spline surface.

它在车身造型，飞机制造和其他工业产品的设计中都有广泛的应用，如构建工业设计用的由复杂边界构成的曲面或是填补型心和型腔造型的零件中的孔洞等。

Datum plane including the plane, side, and face.

基准面包括平面，侧面和端面。

It shows that, apart from the usual elements for the tree root and feature type, a datum plane contains the positioning constraints and an optional fit type.

它展示了，除了通常的树根和特征类型等元素，一个基准平面包含位置约束和一个可选配合类型。

According to the definition of the minimum zone method, the mathematical model is presented for evaluating flatness error and establishing datum plane equation.

分析了常用的近似评定法(三点法、对角线法、最小二乘法等)存在的局限性，根据最小区域法的定义，给出了基准平面方程及平面度误差评定目标函数数学模型的建立方法，并举例说明了采用Matlab进行平面度误差的计算。

Furthermore, a new algorithm based on Fourier-transform technique combining with different calculations is proposed, which is suitable to measure steps. The new algorithm overcomes the disadvantages of old one needing datum reference and plane of reference, increasing this algorithm's utility.

基於傅里叶变换的波长移相算法，提出了结合差分运算的适合於台阶测量的新算法，克服了已有算法中需要参考基凖和参考面的缺点，提高了算法的实用性。

Snap lines can be assigned to a view, a datum plane or any geometry edge and then move with that view.

捕捉线能够被指定给一个视图，基准面和任何边线，并且，捕捉线会跟随视图移动。

In the planetary orbit more or less (is called ecliptic surface and take the revolution in the identical plane as datum).

行星轨道中或多或少在同一平面内（称为黄道面并以地球公转轨道面为基准）。

Height datum: Symmetry plane or the bottom surface.

高度基准上下对称面或底平面(Z = 0)。

In the shape analysis of stress surface contour of 3D footprint, the consistency of datum plane cannot be strictly controlled, so a descriptor insensitive to perspective transform is needed.

在立体足迹的重压面边界围线的形状分类和识别中，由于不能严格控制基准面方向的一致性，必须采取对透视变换不敏感的描述方法。

Obviously,once the definite height of datum plane is adopted,it means to establish a height system which may be used-in this area for a long period.

海岸工程基准面高低虽然不影响工程的实施与效果，很明显，启用一个基准面之后就意味着树立了一个高程系统，它将长期在当地起作用并带来广泛影响。

I go to school at night.

我是上上学。

Clear Tip Nasal Aspirator: A soft time and gentle suction action makes removing excess mucus easy.

鼻吸明确提示：一个柔软的时间和温柔吸力行动使消除过剩的粘液容易。