查询词典 necessary condition

The basic steps of this method are as follows.The firststep is to derive a necessary condition such that the families of quasipolynomials withone parameter,corresponding to the edges of the polytope,have pure imaginary rootsby using the Dixon's resultant for polynomials.Then to check that the casescorresponding to the parameters obtained in the first step are in fact impossible byusing the generalized Sturm criterion and some stability criteria.

其基本思路是先利用多项式方程组的Dixon结式理论导出使各棱边对应的单参数特征拟多项式有纯虚根时，参数值应满足的一个等式条件，即所谓的Dixon结式等于零，然后由广义Sturm判别法验证对所有参数值，Dixon结式不等于零，或使结式等于零的解不产生特征拟多项式的纯虚根。

The existence of a regular Red Army of adequate strength is a necessary condition for the existence of Red political power.

相当力量的正式红军的存在，是红色政权存在的必要条件。

lectures on the spot machining industry is undergoing structural changes. The design and improvement of technology and equipment have become a necessary condition for the existence and development of enterprises. Process Equipment Design and direct impact on improving the quality and performance valve rocker arm shaft bearings.

现货机械加工行业发生着党课的结构性变化，工艺工装的设计与改良已成为企业生存和发展的必要条件，工艺工装的设计与改良直接影响着气门摇臂轴支座的质量与性能。

In order to raise the rate of the rootage and survival of the cutting, save labor-power, reduce labor intensity and cut down the cost,we have developed the ecological environment auto control system for cutting transplant in the green house .It is able to control the greenhouse environment for the whole process of the cutting transplant and to satisfy the necessary condition of it.

为提高扦插苗木的生根率和成活率，节省人力，减少工人的劳动强度，降低育苗成本，我们研制了扦插育苗大棚生态环境自动化调控系统，实现了整个育苗过程大棚环境的自动化调控，满足了扦插苗木对环境的要求。

That a syllogism includes exactly three terms should not be viewed as a rule of a syllogism but a necessary condition for forming a syllogism.

"一个三段论有且只有三个概念"是构成三段论的条件，不是三段论规则。

In this paper,it introduces the ways from four aspects to improve the quality of teaching affairs management:to improve the quality of titles is the key to improve the quality of whole examination;to enhance the test management work is the protection to improve the quality of whole examination;to build and complete the examination question bank is the development trend to improve the work of examination scenically and stander;to build the evaluation system for examination quality is the necessary condition to improve the examination quality.

本文从四个方面提出了高校教学管理工作中如何提高考试工作质量的途径：提高试卷命题的质量是提高整个考试质量的关键；加强考试组织管理工作是提高整个考试质量的保障；建立和完善试题库是促进考试工作科学化、标准化的发展方向；建立考试质量评价系统推动考试质量不断提高。

Negative strain rate sensitivity is proved to be a necessary condition for the occurrence of the serrated flow.

负的应变速率敏感性只是锯齿流变产生的必要条件。

Meanwhile, the sufficient and necessary condition for the orientation of an arbitrary simple polygon is given.

同时，给出了任意简单多边形走向的充要条件。

This kind of problems is first changed into the model of perceptrons in neural theory, Under the assumption of a finite set of social states. a sufficient and necessary condition for single-valued choice functions to be sum-fuzzy implementable is obtained: a geometric characterization is also given: an efficient algorithm for the sumfuzzy implementation of single-valued choice func...

本文在有限社会状态集合的情形，给出了单值选择函数是和型Fuzzy可实现的一个充要条件；并给出了相关几何描述结论；借助于感知器的学习算法规则给出了单值选择函数的和型Fuzzy实现的有效算法；最后还给出了一个具体例子。

In this paper, the author gives sufficient and necessary condition of solvable group using the weak c-normality of maximal and Sylow subgroup and gets some results about supersolvability and p-nilpotentlity of groups

作者研究了弱c-正规的性质并用Sylow子群和极大子群的弱c-正规性来确定一些群的结构，给出了一个群为可解群的充分必要条件，同时由极大子群、Sylow子群的弱c-正规性得到群G p-幂零、超可解的有关定理。

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％。