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The equations for the helicoid and cross section of a ballscrew are worked out and a numerical integral method for the computation of the moment of inertia of the cross section is proposed.

建立了滚珠丝杠的螺旋面方程及横截面方程，提出一种精确计算滚珠丝杠横截面惯性矩的数值积分法，计算结果表明，传统的简化方法将造成20％以上的计算误差。

A cross with equal arms and a diagonal cross, or saltire, were the most traditional heraldic forms.

跨平等的武器和对角线交叉，或saltire ，是最传统的纹章的形式。

The connection between the cross and the Spirit is inconceivably close and full of meaning. The Spirit brought Christ to the cross and enabled Him to die there.

圣灵与十架之间有密不可分的紧密关系，圣灵引导耶稣上十架，赐祂力量在那儿受苦至死。

Based on the Bernoulli-Euler beam\'s plane cross-section hypothesis under flexure and Vlasov\'s rigid contour premise under non-uniform torsion,a spatial thin-walled beam element with 2 nodes and 14 DOF is developed by independently interpolating bend angles about two prime inertial axes of cross section and warp angle with an interior node set at the midpoint of the element length and the goal is achieved.

根据Bernoulli-Euler梁弯曲变形的平截面变形假定和Vlasov约束扭转的刚周边假定，通过设置单元内部结点，对弯曲转角和翘曲角采用独立插值的方法，建立了2结点14自由度的空间梁元，实现了上述目标，并将其应用到结构的非线性分析中。

This reasoning was tested using a new model, consisting of two hierarchical networks, one implementing interocular competition with weak cross-inhibition and the other implementing pattern competition with strong cross-inhibition.

使用一个由两个分层次网络的新模型可以检验这种推理，一个伴随着较弱的交叉抑制执行内部竞争，另一个伴随着较强的交叉抑制执行着图像形式竞争。

Celtic cross tattoo designs feature a ring around the intersection of the horizontal and vertical lines of the cross.

塞尔特交叉纹身图案特征圈绕水平和垂直相交的线交叉。

The relationship among calcium signal transduction, pollen-ovule interaction, and Programmed cell death was discussed from these studies, and the results are as follows:(1) Great difference was observed in the calcium distribution of pollens in the micropylar canal of self-pollinated and cross-pollinated ovules: a large quantity of calcium precipitates was located on the intine of self-pollinated pollen, while none on cross-pollinated pollen.

研究结果表明：(1)传粉后到受精前，自交和异交授粉胚珠珠孔道内花粉的钙信号表达存在很大差异，前者在花粉内壁上有大量表达，后者则没有。

Based on the 3-D acoustic equation and Tarantola′s generalized inversion theorem, taking into consideration the character of cross-well survey, a 2.5-D cross-well waveform tomography method in the frequency domain is presented here.

从频率域3-D声波波动方程出发，结合井间观测方式的特点，基于Tarantola广义反演理论，提出了一种频率域2.5-D井间波形层析成像方法。

Jeannette Crews Cross Pattern Rose Stitch Prairie Schooner Cross Stitch Bib ...

女船员的两岸格局玫瑰十字绣大草原schooner交叉缝合背带裤。。。

Or all of the cross stitches with laced cross stitch in these designs to create a ...

部分或全部的交叉针与laced交叉缝在这些设计，以创造一个。。。

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。