diameter of a circle

The Wheel PCD(Pitch Circle Diameter) is the diameter of the studs from the centre of the wheel.

常见的螺栓孔有四孔、五孔、六孔等分布模式,孔数与PCD值的乘积是轮毂的一项重要参数,本文旨在讨论用数字图像技术精确检测这些螺栓孔分布的几何数据,如孔心坐标x0,y0,节圆直径PCD,孔与孔之间的夹角θ,轮轴中心的坐标,以及各孔到轮轴中心的半径等等。

The effect of measurement cylinders diameters on the measuring result of the gears M Value is analysed.

分析了圆柱直径的大小对齿轮 M值测量结果的影响 。

Studies on how operation parameters such as imaginary circle diameter, height/width ratio of burner, velocity and momentum of primary air and secondary air affect on boiler aerodynamics are carried out through coal model test.

通过大量的冷模试验研究了假想切圆直径、燃烧器高宽比、一、二次风喷口速度和动量、动量比等设计参数的变化对炉内空气动力特性的影响,得到的结果对锅炉的设计运行具有指导意义。

The diameter of the inside of a round cylinder, such as a tube.

口径圆柱体内侧圆的直径，如管道

Measure the diameter of this circle.

量一下这圆的直径。

the ratio of the circumference to the diameter of a circle.

圆周长度与圆的直径长度的比。

The diameter and the circumference of a circle correlate.

圆的直径与圆周互相关联。

The axis of a circle is its diameter.

圆的轴线是其直径.

Ring's diameter increases as we move away from the apex of the cone.

诸圆环的直径自圆锥顶逐渐增大。

The Method and Instrument of Measuring Addendum Circle and Dedendum Circle Diameter

齿顶圆与齿根圆直径的测量及其量具

diameter of root circular-arc center circle

齿根圆弧中心圆直径

diameter of tip circular-arc center circle

齿尖圆弧中心圆直径

diameter of top circular-arc juncture circle

齿顶圆弧衔接点圆直径

diameter of tip circular-arc juncture circle

齿尖圆弧衔接点圆直径

diameter of root circular-arc juncture circle

齿根圆弧衔接点圆直径

the velocity of light is a constant.

圆的周长和直径的比是常数。

Diameter Tolerance, Ovality and Average Decarburized Layer Depth

直径公差，偏圆度及脱碳层的平均深度

Single cylinder knitting machines, up to 165mm diameter

直径165毫米以下的单针筒圆型针织机

The ratio of circumference to diameter is approximately 3.1416.

圆周长与直径的比大约是3.1416。

"because a straight line can be thought of as an arc of a circle of infinite radius, its curvature is zero."

直线可视为半径无穷大的圆,曲率为0

Characteristics of Small Hole Grinding for Hard and Brittle Materials;

硬脆材料小直径内圆磨削特性的研究