必要条件

Two complemented lattices L_1, L_2 are said to be of the same "type" if they have identical sets of tautologies.

一个具有最小元O及最大元I的格L，如果在其中又定义了一个单值的1元运算&′&能适合O′=I，I′'=O，则称L为一可补格，一个命题演算良构式A(设只含命题连接词A，V，～)，如果命它的变数在L中任意取值且将A，V，～分别解释为L中的运算∩，U，′时，A永远得到值I，则称A为L上的恒I式，当两个可补格L_1，L_2上的恒I式集相同时，称L_1，L_2为同型的，本文就是讨论可补格按同型关系分类的问题，所得结果如下：定理设有限可补格L_2适合条件：，存在一良构式A能使则任一可补格L_1与L_2同型的一个充分必要条件是：(A_1)。

From the view of our country,it is not only the political ensurence of training all kinds of talents in all special fields who are needed in the modern socialist construction,but also the important means to resist the intention of westernizing and separating China of the western countries,and it is also necessary for resisting and struggling against all kinds of non scientific beliefs.In the view of individual up growing of coll...

从国家的角度讲，它是培养社会主义现代化建设所需的各类专门人才的政治保证，是抵制西方国家&西化&、&分化&图谋的重要手段，是抵制和反对各种非科学信仰的必要条件；从大学生个人成长的角度讲，只有加强信仰教育，才能塑造大学生健康完美的人格，培养良好的政治素质，实现自身价值，完成时代赋予的重大使命。

That is the bargain that makes this work. That must be the guiding principle of international cooperation.

这是成功的必要条件，也是国际合作所必需的指导原则。

Note that, the choice of resistance must ensure that the necessary conditions of work TL431 is the current through the cathode is greater than 1 mA.

需要注意的是，在选择电阻时必须保证TL431工作的必要条件，就是通过阴极的电流要大于1 mA 。

On Earth, a liquid ocean was needed to nurture the chemical processes that lead to the appearance of life.

在地球上，海洋是形成生命的化学过程的必要条件。

Collagen gel induced cleavage of FAK in various cell types, but did not necessarily induce apoptosis of them.

在不同型态的细胞中发现胶原蛋白凝胶均会造成FAK的分解，因此FAK的分解并非造成凋亡之必要条件。

The mechanism of energy accumulation and dissipation of rock masses during loading is analyzed to establish the qualitative and quantitative relations between the composition and texture and the burst potential of rock masses of coal-bearing formation.

煤岩体的冲击倾向性是发生冲击地压的固有属性和必要条件，且影响煤岩体冲击倾向性的因素很多；而煤岩体的物质成分、岩性组构是煤岩体的内在属性，是决定煤岩冲击倾向性的内在因素。

Here, therefore, it was essential that land should be put under grass and corn cultivated.

因此，牧草栽培和谷物种植，在这里就成了必要条件。

The structure of repetitive nets that involve a pair of transitions standing in quasi fair relation (extended but not weak fair relation) is discussed and a Petri net model of the handshake daisy chain arbiter is given.

文献 [1？ 5]对公平 Petri网的性质进行了系统的研究，其中包括给出判定一个网为公平网的几组充分必要条件。作为公平性的一个应用

Of aborning of science and technology applying is the requirement that labor productivity raises, but itself does not create new value.

科学技术在生产中的运用是劳动生产率提高的必要条件，但它本身并不创造新价值。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。