前言

Part Ⅰ is an introduction on the backgrounds, significations and research plan etc.

第一部分即前言部分，简要的介绍了开展现代物理技术专题教学的背景、意义、研究计划等。

The content of the first part is the written cause of the paper, the advance of the research and the innovation in this paper.

第一章是前言，介绍了本文的写作缘起、该领域的研究进展以及本论文的创新之处。

The influence of cement parameters (including water and cement ratio, cement and sand ratio and cement fineness etc.)on the drying shrinkage of cement mortar were studied.

0前言水泥基材料处于低湿的环境下因水分散失导致体积收缩称为干缩，干缩是使水泥基材料产生裂缝从而导致耐久性下降的重要原因之一。

PremiseN,N-Dimethylformamide, a good organic solven with low noxiousness, is mostly used in extractions, organic synthesises, dyestuffs, fibres, leathers, pharmacies and so on.

前言 二甲基甲酰胺(N，N-dimethylformamide，DMF)作为一种良好的有机溶剂广泛应用于纤维、皮革、染科及制药等工业生产中，属于低毒类物质。

A threedimensional flow field of a high-speed centrifugal compressor has been investigated by numerical simulation in this paper.

0前言离心压气机在航空航天、能源、化工及冶金等部门发挥着极其重要的作用。

In the preface, first, I annoate and define the implications of underachievement and underachievers in middle schools, I introduce the study about underachievement in China and overseas.

本文在前言中对学业不良的定义及中学学业不良学生进行了诠释和界定，并介绍了国内外学业不良的相关研究。

Thinking of research and structure of the whole this text are arranged as follows:The first part is an introduction, mainly introduced current balances between income and expenses the influence research background based on the RMB revaluation to our country import-export trade and the significance.

整体的研究思路和结构安排如下：第1部分为前言，主要介绍了当前基于人民币升值对我国进出口贸易收支平衡影响的研究背景和意义。

Thinking of research and structure of the whole this text are arranged as follows:The first part is an introduction, mainly introduced current balances between income and expenses the influence research background based on the RMB revaluation to our country import-export trade and the significance.

整体的研究思路和结构安排如下：第一部分为前言，主要介绍了当前基于人民币升值对我国进出口贸易收支平衡影响的研究背景和意义。

It analyses the philosophy thoughts in Beauvoir's novels and reveals the philosophy meaning a...

前言部分简单地回顾了波伏娃研究的现状，指出先前研究的不足之处，点明了对其小说的哲学思想进行研究的理论依托。

The effect of binder and lubricant on the flow time and the apparent density of iron powder was investigated.

前言流动性和松装密度是铁粉的两个重要工艺性能，直接影响到装粉过程和压坯密度的均匀性。

The concept of equivalent rotationally rigidity is offered and the formula of rotationally rigidity is obtained.

主要做了如下几个方面的工作：对伸臂位于顶部的单层框架—筒体模型进行分析，提出了等效转动约束的概念和转动约束刚度的表达式。

Male cats normally do not need aftercare with the exception of the night after the anesthetic.

男猫通常不需要善后除了晚上的麻醉。