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From the viewpoint of axial symmetry or centrosymmetry between t and t in logic, this paper makes a minute analysis about the negation operation under different conditions in 1-order uncertainty, puts forward negation operation axiom, and does a systematic research on the definition, properties, and generation of negation operation.

从t与t在逻辑上具有轴对称性或中心对称性出发，详细分析了1阶不确定性中不同条件下的非运算，提出了"非"运算公理，系统研究了"非"运算的定义、性质和构造。

Change one's mind and assume the opposite viewpoint .

改变某人的主意或着设想与原来相反的看法。

Spectral element methods for partial differencial equation is introduced in this study from viewpoint of the collocation approximation of Chebyshev polynomial. Wave Equation and its space discretization are deduced. Two time integral methods, central difference method and implicit Newmark method, are introduced, and their stability and applicability are also discussed in some details. The significance of absorbing boundary conditions in spectral element methods for Aeroacoustics is explained, and Clayton-Engquist-Majda absorbing boundary conditions is emphasized and introduced, then the discrete scheme of this boundary conditions is deduced and applied to spectral element methods for wave equation.

本文从Chebyshev多项式逼近理论出发，详细介绍了谱元方法求解偏微分方程的过程；推导了流体中的声波动方程并在空间上对其进行了谱元离散；详细讨论了两种时间积分方法──中心差分法和Newmark方法，分析了它们的稳定性条件，并从理论上对比了两种方法的优缺点和适用范围；将吸收边界条件推广应用于谱元方法求解气动声学问题中，重点介绍了Clayton-Engquist-Majda吸收边界条件的原理和公式，推导了该吸收边界条件的变分形式，并将其引入波动方程的离散形式中。

From the chemical bond viewpoint, dielectric properties of some practical materials with various crystal structures were quantitatively studied.

利用化学键的观点定量地研究了一些具有各种晶体结构实用材料的介电性质。

The viewpoint of mechanical chemistry was firstly applied to analyze the forming mechanism of chemical bond.

首次应用机械力化学的观点，分析了型煤内化学键形成机理。

The form of Rococo music is introduced, and a viewpoint is put forward, that is, accompany with the appearance of Chinoiserie, the Chinese art styleinfluences the form of Rococo musical style to a certain extent.

三、洛可可音乐风格与18世纪"中国热"。此部分对洛可可音乐风格的形成作了介绍，并且初步提出一个观点：伴随着"中国热"出现的中国艺术风格在一定程度上影响到了洛可可音乐风格的形成。

The copyright of 80% above number of program of mainstream Chinese movie and TV changes exclusive hold by net Shang Wen, net Shang Wen changes the anthology of abroad and outstanding theatrical work that accords with Chinese culture viewpoint of value choicely at the same time and film to introduce the mainland, include Korea SBS, United States Disney channel and Ying Chao direct seeding.

主流华语影视节目的80%以上数字版权由网尚文化独家持有，网尚文化同时精选符合中国人文化价值观的海外优秀剧集和电影引进到大陆，包括韩国SBS、美国迪斯尼频道以及英超直播等。

The color research range is concluded from the viewpoint of vision art, including the color of paint or sketch from nature, decorative color, and color composing, which make different chromatics of three emphases.

从视觉艺术的角度对色彩研究范围进行归纳，将色彩学归纳为：写生色彩、装饰色彩、色彩构成三种侧重角度不同的色彩学。

Therefore, we should use the viewpoint of the system theory to inspect the development mode of circular economy.

因此，我们应该利用系统的观点来看循环经济的发展模式。

Citral is an extremely important aliphatic acyclic terpene aldehyde and, because of its unusual structure, it possesses properties which are of interest both from an academic and a practical viewpoint.

由于其特殊的结构，因此柠檬醛的性质无论从学术或实用的角度来看，都很重要。

The system can be widely used in belt weighing and batching process control,etc.

介绍了基于智能模糊控制的嵌入式配料系统的设计方法，对模糊PID控制过程和系统调零作了重点的讨论，同时给出了PID控制的程序流程图和系统定长调零子程序。

"I dunno," she answered,"but if you show me aroun', I'll recognize it from the lighthouse just outside the porthole."

"我不知道，"她回答说，"如果你能带我转转，我能认出来的，因为灯塔就在舷窗外。"