查询词典 concave

The other is concave upward with younger rocks of Silurian shale and siltstone toward the center of curvature. The former is called anticline and the latter syncline. The sides of the folds are known as limb s

而另一个褶曲向上凹，较新的志留系页岩和砂岩位于弯曲的中心部位，前者被称为背斜，后者则称之为向斜，褶皱核部两侧叫做褶皱的翼部。

And then there is a chin rest I am going to put my chin on and I'm going to be staring into quite a large concave perspective thing but within this a whole lade of cameras are going to scan my face so here we go.

接下来的过程中我将要把下巴搁在下巴架上，然后凝视一个相当大的凹面远景。在凝视的过程中会有很多相机扫描我的面部。我们开始下一步吧。

Compared with prior art, the method of the invention carries out the cineration process under low temperature, so concave defects on the metal interconnection lines near the through hole during the cineration process under high temperature can be avoided, thus improving finished product rate.

与现有技术相比，本发明的制造方法通过在低温条件下进行灰化步骤，避免了因高温条件的灰化步骤造成通孔附近的金属互连线出现凹形缺陷的现象，从而提高产品的成品率。

Consider the circle that is tangent to the curve at and has the same curvature there. Its center will lie on the concave side of the curve. This circle is called the circle of curvature. Its radius is the radius of curvature, and

在点处的曲线的法线上，在凹的一侧取一点，使得，以为圆心，半径为的圆叫做曲线在点处的曲率圆，曲率圆的圆心叫做曲线在点处的曲率中心，曲率圆的半径叫做曲线在点处的曲率半径。

Double circular arc gear is a style of gears, which has convex-concave tooth profile and work in high efficiency.

双圆弧齿轮是一种具有凹凸齿廓啮合的高效齿轮，其优点是承载能力高，制造工艺简单，成本低。

This paper also describes the conditions for ensuring two engagement lines with double concave-convex circular arc profile.

讨论了中心距偏差和切深偏差相互补偿问题。文中还讨论了双圆弧齿形保持双啮合线的条件。

Researches show that the drive force characteristics of the electric tractor drive system based on series DC motor is close the ideal characteristics, the curves are concave, low speed with constant power, and high speed with constant torque; the electric tractor has large working speed under different shifts, but the extensive coincidence speed shows that the variable ratio of the gear is unreasonable; the maximum climbable gradient of this electric tractor is more than 30%, and does not need frequent shift when working for its extensive climbable gradient; there are many influence factors of continuous working time, which the more obvious factors are working speed and working load, the working time increases with the increase of the working speed and working load.2. Simulation researches on the drive characteristic of the electric tractor.

研究结果表明：基于串励直流电动机(来源：ABC21论文网www.abclunwen.com)的电动拖拉机电驱动系统的驱动力特性场接近理想驱动力特性场，其各挡下的驱动力特性是一组下凹的曲线，低速恒转矩，高速恒功率；同一行驶速度下所对应高挡驱动力大于低挡驱动力，这是由电机的调速特性决定的；电动拖拉机各个挡位下具有较广的稳定作业速度范围，但是各个挡位之间速度重合的范围较多，说明所用变速箱变速比与电动机匹配不合理；电动拖拉机最大爬坡度达到30%以上，并且各挡爬坡度变化范围较广，作业过程中不需要频繁换挡；影响电动拖拉机连续作业时间的因素较多，其中作业行驶速度和作业负荷影响最为明显，作业负荷越大，连续作业时间就越短，作业速度越快，连续作业时间就越短。2、电动拖拉机驱动特性仿真研究。

This paper proposes an algorithm for union, intersection and trim of the closed region, which is based on convex-concave points.

本文提出了一种基于交点的凹凸性求封闭区域的并、交、差的算法。

A cylinder is a hollow tube with a closed concave base that permits it to stand up right.

钢瓶是中空的管道，封闭的底部是凹入的，这样可以直立起来。

A cylinder is a hollow tube with a closed concave base that permits it to stand upright.

钢瓶是中空的管道，封闭的底部是凹入的，这样可以直立起来。

Listen,point and check your answers.

听，指出并且检查你的答案。

Warming needle is one of effective treatment methods for knee arthralgia aggravated by cold,and it is simple,safety,so it should be developed in clinical acupuncture and moxibustion extensively.

但以本院科针灸门诊在2005年1月—2006年6月期间共收治膝痛患者100余例，经过临床的诊断后，其中施以温针治疗的48例，疗效显著，报道如下。1临床资料本组病例48