查询词典 necessary condition

We obtain a necessary and sufficient condition for the existence of a type of quarticcurve separatrix cycle s in the quadratic system.

本义给出了二次系统存在一类四次曲线分界线环的充要条件，此类分界线环的方程为（y＋cx￣2）－x￣2＝0。

I wish to assist Mr Akmal Shaikh in his medical and mental condition, if necessary in China.

我希望在他的精神状态问题上提供帮助，如果有必要可以去中国。

I wish to assist Mr Akmal Shaikh in his medical and mental condition, if necessary in China.

我迅速联系了英国外交部，希望能够在身体和精神方面有所帮助，如果中国觉得有必要。

For each type of testing, a necessary and sufficient condition is defined, under which a test sequence of an FSM is synchronizable. In this paper a new model—synchroniable digraph is proposed, which can judge whether there exist any synchronizable test sequence for a given specification without synchronization operation, and which can transform its nonsynchronizable test sequence to synchronizable test sequence if the answer is true. A method to judge how to add external synchronization operations in a nonsynchronizable test sequence to change it to synchroniable one is also proposed.

提出了一种新的同步测试序列生成模型——同步有向图，它可以判断一个给定的协议规格是否可以在不需要外部同步操作的情况下，产生同步测试序列；如果可以产生，则此生成模型可以将非同步测试序列转化为相应的同步测试序列；另外此生成模型还可以用来选择为测试系统增加外部同步通道的方法。

In this paper,by the matrix method,a necessary and sufficient condition for two n-dimensional synclastic simplexes to be able embedded in the n-dimensional Euclidean space is obtained,as well as for two group finite point sets.

该文利用矩阵的方法，获得了两个同向的n维单形同时等距嵌入E~n维欧氏空间的一个充分必要条件是：对于预给(n+1)~2个距离，满足一组具有行列式形式的不等式组det，由此可以得到两组等数量的有限点集合到E~n维欧氏空间中等长嵌入的一个充分必要条件。

It has also been found that acidic medium is necessary for the formation of protonated monomer and dimer. The stability of the dimer of the tungstophosphate is lower; a pure monomer can be obtained by treating the mixture with a base (Bu4NOR). However, the dimer of tungstosilicate is stable under the same condition.

实验结果还表明，酸性介质是生成质子化单体和二聚体的必要条件，且钨磷酸盐二聚体的稳定性较低，用碱(Bu4NOH)处理合成产物可得纯的钨磷酸盐单体，而相同条件下钨硅酸盐的二聚体却比较稳定。

Linear algebra was used to derive an analytical expression for its point unfalsified probability , for the necessary and sufficient condition of the model set being consistent with the frequency domain input-output data.

应用线性代数方法通过对模型集进行讨论，根据一个模型集与对象频域输入输出数据相一致的充要条件，建立了模型集点非伪概率的解析表达式。

Accordingly, below current condition, to improve the work efficiency of administrator, two kinds of companies have completely those who increase its actuating pressure is necessary.

因此，在目前的状况下，为了提高治理人员的工作效率，两类企业完全有增加其工作压力的必要。

On this view, co-opting the technical trade press is necessary but not sufficient; it's important essentially as a pre-condition for storming Wall Street itself through the elite mainstream media.

按照这种观点，拉拢技术贸易新闻界是必要的，但还不够，它的重要的先决攻坚，通过主流媒体的精英，华尔街自身条件出发点。

It is also necessary to ensure that the deviation is within the rim of idler and drum, that there is no scoring on the rubber belt or forbidden friction, that all idlers are flexible in turning when coaling, and that interlocking parts and each emergency button are in good condition.

还应注意：启动和停止时，拉紧装置工作正常，胶带无打滑现象；胶带运行平稳，跑偏不应超出托辊和滚筒的边缘；不得刮伤胶带和不允许的磨擦现象存在；上煤时，全部托辊应转动灵活；联锁和各事故按钮应工作良好。

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％。