有效操作

So the economic and effective, simple operation of fluoride method is very necessary.

因此研究经济有效、操作简单的除氟方法非常必要。

By using an abstract rooted network data model, GIES uniformly organizes and stores all kinds of structured objects processed by the environment system, and provides a set of uniform, general purpose full-screen editing system commands in order that users can process and treat each of the environmemt components effectively by using the same set of editing ...

它通过一个抽象的有根网络模型统一地组织和存贮环境系统所予处理的各种结构化对象，并相应地备有一组通用一致的全屏幕编辑命令，以便于用户能够利用同样的命令和操作，对环境系统的各项成分进行有效的加工和处理，力求用户接口界面的简明与友好。本文主要论述GIES的基本设计思想、系统组成和实现概况。

This is because generically we do not know what to do that would be effective; because we do not know what questions we are trying to answer, until we start operating on this system.

这是因为一般来说，我们不知道如何作是有效的；因为我们不知道我们尝试回答的问题，直到我们开始在这个系统上操作。

The direct cause of the accident is the use of geometrically unsafe process equipment and personnel violation. However,the root cause is lack of efficient technical management.

这起事故的直接原因是未采用几何临界安全设备及工人的违规操作，而根本原因在于缺乏有效的技术管理。

Gluteus medius-pedicle bone has a good effect in the treatment of femoral neck fracture with less trauma and conveninece.

结果 8例患者全部在术后3～4.5月愈合。结论臀中肌骨瓣转位移植术是治疗难愈性股骨颈骨折及骨折不愈合的有效方法，创伤小，操作方便。

It was found that the optimum condition for Ag recovery was; Quality rate of tartaric acid and glucose, grain alcohol is 1: 2. 5: 1, at PH is 12, lay down 3 ~5d on the ordinary temperat...

该方法具有操作简单，绿色环保，成本低，有效利用率高等特点，得到令人满意的结果，已在本校实验室投入使用。

In conclusion, endoscopic metal biliary stent placement has a significant effect on hepatic haulm biliary carcinoma which is difficult for surgical resection, and the measure is simple and cost-effective, and has less complications, with safety and feasibility.

初步研究结果提示，胆道金属支架置入对难以手术切除的肝门部胆管恶性梗阻有较明显治疗效果，是一种操作简单、经济有效、并发症少的方法，具有安全性和可行性。

In general, this paper includes several parts, shown as the following: The first part summarizes the background and outline of stock index future and introduce briefly its local status and CSI 300 stock index future contract. The second part has a retrospect of the main academic papers of both local or overseas, and also a discussion of relevant hedge strategies and models, to lay a solid theoretical foundation for the empirical analysis and test for the operation process of hedge in latter parts. The third part outlines the principle, key factors and real operation process of hedge. Moreover, it makes a empirical analysis on popular hedge models with HK Hang Seng index. In the end, it test the hedge effect of trading on IF0706, CSI 300 stock index future contract, with CCB select-growth securities fund as present underlying. The fourth and also the last part, explores how to define hedge ratio in china mainland market. It includes the stability test ofβfor local securities portfolio, adjustment of historicalβand best data length for estimation of historicalβ, etc. Also, the thesis makes some beneficial experiments on the definition of best data length for estimation of historicalβ, survey of fashion forβand variation for industryβs. Fortunately, it's got some meaningful results.

按照以上研究思路，本论文论述由以下几个部分构成：第一部分，简要概述股指期货产生的背景和基本情况，对国内股指期货进程和沪深300股指期货合约进行简单介绍；第二部分，回顾海内外股指期货避险研究的主要文献，讨论相关避险策略及避险模型，为后面套期保值策略如何有效运用的实证分析和检验提供理论基础和依据；第三部分，对套期保值的原理、关键因素及实际流程进行概述，并采用香港恒生指数对常用的几种避险模型进行实证分析，最后一揽子以建信优选成长股票型基金为现货标的，实际检验以沪深300股指期货模拟交易IF0706产品进行对冲时的套期保值效果；第四部分，探讨国内确定避险比率的过程，包括国内股票组合β值的稳定性检验、历史β值的修正及估计历史β值的最佳数据长度等，通过数据分析，本文在寻找估计β值的最佳数据长度和考察风格、行业β值的差异上做了较为有益的尝试，并得到了有助于现实操作的结果。

At the same time, to make users maintain their system conveniently, we add a human-computer dialogue equipment in the system, users not only can observe all the state of the system but also can deal with the obstacle quickly and efficiently according to the alarm data , which applied by the equipment. It exhibit the humanization design in the new type electric control system of hoist much more.

同时为了用户的操作维护更加方便高效，系统使用了本公司开发的友好人机交互系统，使用户可以观察到系统的所有状态，并可根据该设备提示的报警信息来对系统进行快速有效的故障处理和日常系统维护，更加体现了起重机新型电控系统的人性化设计。

It is still safe and effective to operate at state of bulbi hypertonia by sufficient preoperativepreparation, perfect manipulation and reasonable dealing after operation.

充分的术前准备，熟练的术中操作以及合理的术后处理，在高眼压状态下采取手术治疗仍安全有效。

According to the clear water experiment, aeration performance of the new equipment is good with high total oxygen transfer coefficient and oxygen utilization ratio.

曝气设备的动力效率在叶轮转速为120rpm～150rpm时取得最大值，此时氧利用率和充氧能力也具有较高值。

The environmental stability of that world - including its crushing pressures and icy darkness - means that some of its most famous inhabitants have survived for eons as evolutionary throwbacks, their bodies undergoing little change.

稳定的海底环境─包括能把人压扁的压力和冰冷的黑暗─意谓海底某些最知名的栖居生物已以演化返祖的样态活了万世，形体几无变化。