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It is not necessary to you to think about the mistake on the operation.

你不必再去多想手术上的失误了。

Easy-to-use scales are provided wherever necessary, for operations following a brain chart.

便于移动、使用的标尺。

Such being the case, it is greatly necessary to introduce a set of operatively value system to assist enterprise to fulfill t

通过研究发现经济附加值价值模型是目前国际上比较成熟的、能帮助企业实现价值创造的重要工具，因此本文通过研究分析经济附加值模型在实践中的运用，以寻求帮助国内企业建立价值导向的管理方法。

In order to reconstruct the paleo-tectonic history,the ophiolite suite in combination with the arc igneous rock assemblage is necessary to be used and the cause of the compositional polarity for the arc igneous rocks is discussed.

指出由蛇绿岩套再造的古构造历史可能是残缺的，结合弧火成岩的厘定可在某些方面弥补这个不足，讨论了弧火成岩组成极性形成的可能原因。

For the delinquent, to apologize is usually necessary, according to Oppenheim's International Law.

奥本海国际法》指出："不法行为者方面的正式道歉通常是必要的。"

It is usually necessary for your optician to conduct further tests to work out exactly what kind of glasses you need.

这通常是必要的为您的配镜师进行进一步的测试工作，到底什么样的眼镜，您所需要的。

It is necessary to select the optimal treatment process because of the change of raw water quality.

水源水质的变化对给水处理工艺的选择提出了客观要求。

The optimality criterion that the aseismic structure must satisfy as it is optimal is derived by using the Kuhn-Tucker necessary condition, and its meanings are also interpreted from the point of view of physics.

从数学规划中的Kuhn-Tucker条件出发，推导出结构抗震可靠性的优化准则，并在物理上解释了该准则的含义。

Calculous is one of the required courses for non-arts students in vocational and technical institutes. Many students have difficulties in learning Calculous because of the characteristic of the course and basic knowledge level of students, so that the situation of teaching Calculous is not optimistical in vocational and technical institutes. Hence, it is necessary to properly reform the teaching of Calculous in those institutes.

微积分学是职业技术学院非文科专业学生的必修课程，然而由于学科本身的性质以及学生的基础状况，有许多学生对微积分的学习感到困难，使得职业技术学院微积分的教学现状并不乐观，因此有必要对此类学院的微积分教学进行适当的改革。

Secondly, the Shanghai real estate market is necessary to further adjust and optimize the structure.

其次，上海的房地产市场有必要进一步调整和优化结构。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。