必然

The disclosure system of criminal evidence is basic system of antagonistic criminal litigation,is basic guarantee for adjudgment justice with efficiency,and also is necessary requirement of procedure justice.

刑事证据开示制度，是对抗制刑事诉讼基本制度，是审判公正兼顾效率的基本保障，亦是程序公正的必然要求。

The perfection of witness system is the urgent demand and inevitable result for the way of civil adjudication.

证人制度的完善是民事审判方式改革的迫切要求和必然结果。

It is very necessary to adopt an effective method to promote environmental education.

采取一种有效的方法来开展环境教育是一种必然。

Based on varying process of generator terminal parameters after excitation fault, shortages of excitation protective principle of static stability boundary and asynchronous impedance boundary are analyzed. It proposed that excitation fault research relates to large-disturbance stability. Because dynamic power-angle character of generator after excitation fault is non-sinusoidal, there are differences between dynamic power-angle character and static state power-angle character. So it isn't ideal to protective operation result based on small-disturbance stability and static stability boundary criterion. At the same time, it proposed that asynchronous boundary impedance criterion is a constant reactive power circle moving adown j Xd′. It can ensure complete loss-of-excitation generator measuring impedance enter into the circle, but can't ensure the other condition measuring impedance including impossible losing synchronism enter. So loss-of-excitation protection would be maloperation when system voltage drops short and recovers or generator rejects load.③Based on stability principle, it puts forward setting conditions and calculation method of generator loss-of-excitation protection by direct measuring power-angle.

以励磁故障后发电机端的相关参数的变化为基础，通过对以静稳定边界和异步阻抗边界作判据的两类三种现行励磁保护在原理上存在的缺陷分析，发现：励磁故障是一个大干扰稳定性问题，励磁故障后的发电机的动态功角特性与静态功角特性有很大的差异，已远非正弦曲线，因此基于小干扰稳定性原理、以静稳定边界作判据的保护必然动作不理想；异步边界阻抗判据是一个下移j Xd′的等无功阻抗圆，它可以保证完全失磁后的发电机测量阻抗能进入该阻抗圆，但不能保证完全失磁之外的其它状态不会进入该阻抗圆，因此在系统电压短时下降或发电机突然甩负荷等情况下可能启动该保护使之误动。

Since what is kept must be adulterated?

既然那保持的东西也必然会腐败？

Geological condition is the important factors in study on tunnel excavating disaster inevitably. From the aeolotropy of hard rock of tunnel engineering region, the stress distribution of several kinds of fault to the water gushing of tunnel, the type of geology disaster involved in macrocharacter, main control factors, disaster mechanism and control strategy in tunnel excavating are studied systematically in this thesis.

中文题名隧道开挖地质灾害规律与防治对策研究副题名外文题名 Study on tunnel excavating geology disaster regular and control trategy 论文作者杜炜平导师古德生院士学科专业岩土工程研究领域\研究方向学位级别博士学位授予单位中南大学学位授予日期2001 论文页码总数108页关键词隧道工程地质灾害岩爆馆藏号BSLW /2003 /U45 /1 隧道开挖灾害研究必然以地质因素为其主要研究对象。

It is necessary and rational in the early stage of technological development that aerial photography separates from survey.

这种航空摄影与影像测量分离的现状，在技术发展的初期是必然的，也是合理的。

So it should play an important role in human being's aesthetic education .

因此它在人类的美育中必然发挥着重要的作用。

Friendliness is a defining characteristic of affability .

友善是和蔼的必然特征。

But I also affirm the need to do lots of pracice that does not have to be finished work.

但我也确认需要很多的练习，而这些练习和最终的工作没有必然的的联系。

In the United States, chronic alcoholism and hepatitis C are the most common ones.

在美国，慢性酒精中毒，肝炎是最常见的。

If you have any questions, you can contact me anytime.

如果有任何问题，你可以随时联系我。