必要条件

The definition of a safety valve: the broad sense, including the so-called safety valve discharge valve, from a management point of view the rules, directly installed in the steam boiler or pressure vessel on a class of its necessary conditions for technical supervision departments must be approved by valves, a narrow sense, is called safety valve, the other commonly known discharge valve.

安全阀的定义：所谓安全阀广义上讲包括泄放阀，从管理规则上看，直接安装在蒸汽锅炉或一类压力容器上，其必要条件是必须得到技术监督部门认可的阀门，狭义上称之为安全阀，其他一般称之为泄放阀。

China advocates mutual respect for state sovereignty and maintains that priority should be given to the safeguarding of the right of the people of the developing countries to subsistence and development, thus creating the necessary conditions for people all over the world to enjoy various human rights.

中国主张相互尊重国家主权，优先维护广大发展中国家人民的生存权和发展权，从而为全世界广大人民享受各项人权创造必要条件。

The requirements of avalanche formation are the thickness of snow and the slope angle.

雪崩的形成和发生的必要条件是一定深度的积雪和一定范围的坡度。

Power balance is necessary to ICF, including the energy balance and pulse shape uniformity at the target.

功率平衡作为对称性惯性约束聚变的必要条件，它是指多路激光脉冲到靶点的精确同步、能量平衡且波形一致，即瞬时功率平衡。

The material purchasing is not only a necessarycondition for the smooth development of social reproduction, but also animportant premise for ensuring enterprise's self-surviving and developmentand enlarging economic profits.

随着社会主义市场经济体制的不断完善，将企业推向市场，因此，搞好物资采购不仅是社会再生产顺利进行的必要条件，也是保障企业自身生存与发展与提高经济效益的重要前提。

Cohen comes to the conclusion that achieving socialist equality means that the principle of self-ownership must be spurred.Spurring the principle of self-ownership, in Cohen's view, is the necessary condition of achieving socialist equal distribution.

在柯亨看来，摒弃自我所有原则是实现社会主义平等分配的必要条件，而要摒弃自我所有原则，必须首先驳倒自我所有原则赖以确立的自我所有命题。

Enough high special surface ares of the powders and a appropriate content of volatiles (from 10% to 15% in weight) in the powders and the essential conditions to cause the powders possessing the excellent self-binding and self-sintering properties.

并认为：足够高的表面积和适当的挥发份含量是生焦粉有良好自粘结和自烧结性能的必要条件。

Media is the necessary condition for better representing the formal beauty of calligraphy and it should be integrated to scope of self-beauty and emphasized so as to seek the breakthrough, express the calligraphy beauty and achieve greater popularity.

载体是更好、更完整体现书法艺术形式美的必要条件，应把其纳入自身美的范畴并加以重视，在书法现代载体的寻求上获得突破，充分体现书法美并使其得以更广泛的传播。

In Chapter 3, we discuss the self-adjoint boundary-value problems for products of m differential operators generated by the same symmetric differential expression of order n defined on a, b

第三章 讨论了m个由同一n阶对称微分算式生成的赋予某种边界条件的微分算子乘积自伴边值问题，结合常微分算子自伴扩张的一般构造理论，分别给出了两个四阶微分算子、两个n阶微分算子、m个n阶微分算子乘积自伴边条件的解析刻划，得到了乘积微分算子是自伴的充分必要条件及与乘积算子自伴性有关的一些有益结果。

The rate constant k ,the activation energy.and induction period of the transestetifieation reaction for the PET/PEN reactive blend were obtained using a kinetic expression based on a second-order reversible reaction mechanism.

根据酯交换反应程度和不同反应温度下的诱导期探讨了酯交换反应与相容性的关系，认为PET与PEN的相容导致或增强了酯交换反应，即相容性是酯交换的必要条件；同时酯交换的发生又促进了PET与PEN的相容。

Singer Leona Lewis and former Led Zeppelin guitarist Jimmy Page emerged as the bus transformed into a grass-covered carnival float, and the pair combined for a rendition of "Whole Lotta Love".

歌手leona刘易斯和前率领的飞艇的吉他手吉米页出现巴士转化为基层所涵盖的嘉年华花车，和一双合并为一移交&整个lotta爱&。

This is Kate, and that's Erin.

这是凯特，那个是爱朗。