两对称

Don't forget that these effects are absolutely symmetrical as between frames of reference in uniform relative motion.

不要忘记的是，在相对匀速运动系统中，这两种效应是完全对称的。

MXCOMP——Compares two symmetric matrices by computing their matrix correlation and then plotting a scatter diagram.

MXCOMP通过计算其相关矩阵和绘制散点图来比较了两个对称矩阵。

MXDOMP——Dompares two symmetric matrices by computing their matrix correlation and then plotting a scatter diagram.

MXDOMP通过计较其相关矩阵和绘制散点图来比较了两个对称矩阵。

Methods Implants with different screw thread angles and shapes were divided into three groups.

方法采用三维有限元法，分别对种植体施加30牛顿垂直和斜向45°两种方向的集中载荷，对不同螺纹顶角螺纹形状分别为对称、上平下斜、上斜下平的种植体-骨界面进行应力分析。

Using the bond-fluctuation-model and vacancy-diffusion-algorithm,the microphase structure, segment profile and structure factor of molten symmetrical AB diblock copolymer confined between two impermeable plate surfaces are simulated by Monte Carlo method based on simple cubic lattice.

采用改进的键长涨落空穴扩散算法对平板狭缝中的对称两嵌段共聚高分子熔体的微相分离形态、密度分布以及结构因子进行了MonteCarlo模拟。

Condensation condition was studied for lipase-catalyzed synthesis of β-sitosterol ester with conjugated linoleic acid in organic solvent.

采用高效酰化催化法和酰氯化法分别合成了燕尾型胆甾醇酯和对称脂肪族二羧酸胆甾醇酯两类衍生物样品。

The synthesis of the pentacyclic skeleton of Et-743 and the construction of the five chiral centers thereof.1. The core pentacyclic skeleton of phthalascidin was constructed with L-dopa as the starting material via thirteen steps. First, two basic synthons, the C-1 functionalized tetrahydroisoquinoline compounds 8 and N-protected Z-dopa derivative 9, were prepared from L-dopa. They were coupled via amide bond to form the dipeptide compounds 10, which were the first key intermediates. Then the primary hydroxyl groups were transformed into the corresponding amino aldehydes 11 via Swern oxidation. Followed by the intramolecular Pictet-Spengler cyclization, the pentacyclic compounds 12 were synthesized.

五环骨架的构建及五个正确手性中心的确立：1.1我们以L-多巴为起始原料，经过多步官能团保护和转化合成了基本结构单元8然后和苯丙氨酸衍生物9，通过缩合反应生成酰胺中间体10，经Swern氧化得到醛化合物11，然后再次利用分子内改良的Pictet-Spengler反应一步构建c，d两环，得到五环骨架化合物12，最后，实现了21-位羰基向氰基的转化，得到了C-1位官能化的化合物14，化合物14不但具有和Et-743一致的五环骨架，而且分子中五个手性中心立体构型也与其完全相同：其中，3，位和13，位的手性中心由原料L-多巴带入，而1，位，11，位和21，位手性中心则通过不对称诱导而确立。

The Thomas-Fermi model is generalized for an approximately spherically symmetric system, to include the spin orbit coupling energy GL.

本文对于近似球对称的系统将汤、费模型推广以包括自旋轨道耦合能和作为动量和位置的函数的位能这两个因素在内。

Starting from the lighter Mg atom, the both cases in which the autoionizing states are excited from the spherically symmetric and non-spherically symmetric Rydberg targets were investigated with different physical models.

从较轻的Mg原子入手，分别针对球对称靶的和轴对称靶这两种情况，采取不同的物理模型对其自电离弹射电子的能量分布进行了深入的理论研究。

A quarter of a strap-on rocket instead of the whole struture is modelled by using of the geometrical symmertry.

提出利用捆绑式火箭对称性的计算模型，对有两个正交对称面的带四个助推级的捆绑式火箭取四分之一的结构进行分析。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。