轨道的

Periodic Orbit: An orbit which closes on itself.

周期轨道：一个轨道上依靠自己的休息。

Finally, for resolving the waiting problem of the OGY method, we suggest a"middle"periodic orbit method to guide the controlled orbit to close in on the target as soon as possible.

最后，为了改善OGY方法在控制实施前需要等待较常时间的缺陷，我们还提出了"中间周期轨"方法，来引导受控轨道尽快进入目标轨道附近。

Chemical bonds and structural theory of organic chemistry 6 class hoursKnow the history of organic chemistry; Grasp the basic theory of organicchemistry, such as structural theory, chemical bonds, resonance theory, atomic andmolecular orbital theory, and valence bond theory; understand polar and non-polarcompounds, dipole moment and know how to express the structures of organiccompounds with different molecular formulas.

了解有机化学发展简史；掌握有机化学结构理论、化学键理论、共振理论、原子和分子轨道理论和杂化轨道理论；了解极性和非极性分子并掌握有机化合物结构的表示法。

In the paper we consider a wide class of slow-fa.st second order systems and give sufficient conditions for the existence of a singular limit cycle related to a homoclinic orbit.

本文研究一类正二阶快-慢系统中奇性同宿轨道和极限环，并且给出了此系统存在奇性同宿轨道和极限环的充分条件。

In this article, authors mainly study the synchronous accumulative sliding of the roof truss by many orbits, which has more valuable reference for members with high altitude, wide span or synchronous rotation and sliding.

该文重点从屋面桁架多轨道同步累积方法进行研究，该方法在高空、大跨度、同步旋转滑移方面有较高的参考价值。［关键词］伞形钢结构；多轨道；桁架；同步旋转滑移

Standard orthogonal design and Improved orthogonal design are used respectively in transition trajectory optimization design of suborbital launch vehicle.

运用标准正交设计法和改进的正交设计法优化亚轨道飞行器再入段轨道参数。

The article simulates German high-speed track spectrum by MATLAB with trigonometric series method.The arch is modeled by ANSYS and make mode analysis.

考虑轨道不平顺对于车桥振动的影响，本文采用采用德国高速轨道谱，借助MATLAB应用三角级数法数值模拟德国低干扰垂向不平顺样本。

Based on a general review of the present development of unballasted track for high speed railwag in China and abroad,the unballasted track for Qin-Shen passenger train is comparatively analyzed in general structure property,manufacturing and construction,track maintainance,etc.

在综合国内外高速铁路无碴轨道发展及现状的基础上，从结构整体性能、制造与施工、线路维修、初期维修等方面对秦沈客运专线无碴轨道应用情况进行了比较与分析。

Showed that there were direct coupling between unpaired d electron in Mo and H orbitals.

结果表明Mo未成对电子主要处于Mo的d轨道，并与H原子轨道发生直接偶合作用。

Putter Suspended orbit high temperature tunnel kiln (PCS fiber pre-oxidation tunnel kiln), a microcomputer-15 points in 15 high-precision temperature control procedures, different vacuum sealing fan, the wind varies from district to district, stainless steel, and stainless steel track after suspension

高均温悬浮轨道推杆式隧道窑（PCS纤维预氧化隧道窑），采用十五台微电脑分十五区高精度程序控温，不同真空密封风机，各区不同不锈钢风道，经过悬浮轨道和不锈钢网状料盘进行完整的热风循环。

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％。