查询词典 necessary condition

Moreover,the necessary and sufficient condition for a net to be meta fair is simplified based on the primitively repetitive vector set of the net.

此外 ，本文通过网的本原可重复向量集化简了一个网为亚公平网的一组充分必要条件

This paper studies the relations between plane projective correspondence and perspective correspondence and present a necessary and sufficient condition that plane projective correspondence become perspective correspondence.

研究二维射影对应与透视对应的关系，给出二维射影对应是透视对应的充要条件，得到二维射影对应可分解若干次透视对应，进而给出二维射影对应的几何意义。

Besides correct sampling procedures, proper sampling frequency is necessary to monitor the oil condition and the wear trends of machinery components.

除了要保证正确的取样程序外，合适的取样频率也是检查润滑油状况及设备零件的磨损趋势所必须的。

Besides correct sampling procedures, proper sampling frequency is necessary to monitor the oil condition and the wear trends of machinery component s.

除了要保证正确的取样程序外，合适的取样频率也是检查润滑油状况及设备零件的磨损趋势所必须的。

Besides correct sampling procedures, proper sampling frequency is necessary to monitor the oil condition and the wear trend s of machinery components.

除了要保证正确的取样程序外，合适的取样频率也是检查润滑油状况及设备零件的磨损趋势所必须的。

On this basis a pure strategy solution under the condition of grey number position degree was defined and the necessary and sufficient conditions for the existence of the pure strategy solution, or the grey position saddle point were derived.

在此基础上，定义了灰数势意义下的纯策略解，且证明了这一纯策略解存在的充要条件。

In this paper, we discuss when a quartic equation has no real roots, and obtain a necessary and sufficient condition on a quartic equation which has no real roots.

本文讨论了一元四次方程无实根的一些充分、要条件，并得到了一元四次方程无实根的一个充要条件。

It is recommended that you check the condition of seals, Items 13 and 90, and replace them during reassembly, if necessary.

建议您检查密封情况，项目13和90 ，并取代他们在重组，如有必要。

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学研究的范式——比较静态分析，是一种技术，通过这一技术，理论可以被考察研究，以确定理论的可驳斥假说，它是对进行的一种符合的仿真。具体讲，比较静态分析是通过逻辑运算，模拟理论的可驳斥命题即检验条件是什么，从而为理论的验证提供方法。用经济学的研究范式对陕西省"一线两带"的比较静态分析显示，此战略成立的必要条件之一是：随着战略的实施即政府对极化地区的投入，其产出增加应该比其它地区产出增加大，否则这一战略就不成立。也就是说，如果陕北或陕南经济发展更快，集中投资于西安等中心城市，并不是更好的战略。

The results of this paper show that the classical regularity condition or quasi-uniform assumption on the triangula-tion meshes is not necessary to the finite element analysis and thus the scope of finite element application is extended.

以上结果表明，传统有限元的正则性条件或拟一致假设对有些问题来说是不必要的，从而拓宽了有限元的应用范围。

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％。