圆的

A fast and accurate arithmetic method by the judgement standard of using the maximum inscribed circle for evaluating the errors ofroundness is introduced, and a program to evaluate of the errors of the circle roundness is designed in this paper.

介绍了利用最大内接圆判别准则快速精确求解圆度误差的基本思想，设计了用最小外接圆法评定圆度误差的程序设计技术。

Any of various fishes of the family Cyclopteridae,especially Cyclopterus lumpus of North Atlantic waters,having pelvic fin s united to form a suction disk and a body bearing prominent tubercles.

圆鳍鱼圆鳍鱼科的几种鱼，尤其是北大西洋圆鳍鱼，有结合成吸盘的腹鳍，全身呈永久结节状

This method could not only applied to outer noncircular gear with all convex pitch line but also applied to outer noncircular gear with partial concave pitch line and inner noncircular gear.

这种磨削原理不仅可以应用于节曲线外凸的非圆齿轮，而且可以应用于磨削带内凹节曲线的外非圆齿轮及内非圆齿轮。

A line generated by a point on a circle rolling around another circle.

一个圆上的某点在该圆旋转另一个圆时产生的线。

And the polar angle and the polar radius was represented into AutoCAD polar coordinate, the involute was drawn through the spline linear tool. And then, a section of the involute was intercepted with the diameters of the point circle and the root circle, used it as the tooth face of the spline. The involute tooth thickness was drawn using the diameter of the divided circle and the tooth-form was drawn through rotating, mirroring image and cutting.

根据DIN 3960渐开线花键的坐标值，用EXCEL函数功能计算出不同压力角下渐开线的极角和极半径，表示成AutoCAD极坐标并通过样条线工具绘制出渐开线，再用齿顶圆和齿根圆直径截取一段渐开线作为为花键齿面，并用分度圆直径绘制出渐开线齿剖面，经镜像和裁剪便可绘制出渐开线齿形。

So, in this paper, a circular cavity witha large radius is used to replace the straight boundary of thehalf space, then the half space problem can be changed tothe scattering problem of two circular cavities to the steadyincident P-wave . Having the aid of the mature cylinderfunction theory, the general solutions of the wave functionscan be given, and an infinite linear algebraic equations ofthe unknown coefficients in the wave functions can be gottenwith the boundary conditions and the Fourier complex seriesexpansion technology, the infinite linear algebraic equationscan be approximately solved by the finite trunction withsatisfying some definite precision, at the basis of thissolution of the equation, the variations and the lay-outs ofthe DSCF at the circular cavity boundary vs. the differentincident angles, the different embedded depths of thecircular cavity as well as the different dimensionless wavenumber of the incident P-wave.

为此，本文采用一个半径很大的圆孔来代替半空间的直边界，将该半空间问题转化为一无限大空间中两个圆孔对稳态P波的共同散射问题，借助于成熟的柱函数理论，通过写出问题波函数的一般形式解，利用问题的边界条件，并采用复数傅立叶级数展开技术将其化为一个仅包含问题波函数中未知系数的一无穷线性代数方程组，在满足一定计算精度的前提下，通过有限项截断进行近似求解，进而讨论了圆孔边界处的动应力集中系数随不同入射角、不同的圆孔掩埋深度、入射波的不同无量纲波数以及介质的泊松比变化和分布情况。

Base on content of chlorophyll a and feeding type of fish and shellfish a food web methods was designed to control eutrophilication. The native freshwater bivalve,Anodonta woodiana, was selected as a filter to remove the algae in the water. The result is quite satisfied and promising.

本研究以水中叶绿素a浓度为基础，鱼类食性为辅，发现使用本土种且具有经济价值之淡水圆蚌，来作为滤除水中藻类的生态方法颇具可行性，利用藻类吸收营养盐、圆蚌食用藻类、再将圆蚌移除之方式而达到降低水库营养盐能量的目的。

Line Rotary die-cutting on cigarette packs such high-end application has taken shape in rrepublic, a circle applanation process with very little rrepublic is mainly used for large scale of products.

连线圆压圆模切在烟包等高端领域的应用已经初具规模。而圆压平工艺用得很少。主要用于大尺寸产品的模切。

Any of various fishes of the family Cyclopteridae, especially Cyclopterus lumpus of North Atlantic waters, having pelvic fins united to form a suction disk and a body bearing prominent tubercles.

圆鳍鱼圆鳍鱼科的几种鱼，尤其是北大西洋圆鳍鱼，有结合成吸盘的腹鳍，全身呈永久结节状

The SMITH chart is an important tool in solving transmission line problems, and electrolyzing the traditional SMITH chart is of great significance.

SMITH圆图是求解传输线问题的重要工具，将以往的SMITH圆图改为电子SMITH圆图有重要意义。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。