11.1平衡的分类和平衡方法 11.2刚性转子的平衡设计 11.3刚性转子的平衡试验 11.4挠性转子平衡简介 11.5平面机构的平衡设计

1.1机构的组成 1.2机构运动简图 1.3机构具有确定运动的条件 1.4机构的组成原理和结构分析

12-1静不定结构概述 12-2用力法解静不定结构 12-3对称及对称性质的应用 12-4连续梁与三弯矩方程

11-1变形能的普遍表达式 11-2莫尔定理(单位力法 11-3卡氏定理

13-1基本概念 13-2加速运动问题的动响应 13-3冲击荷载问题的动响应

Unit 17 Problems, problems 17.1 Dealing with problems (1)0) Listening and speaking Listen to someone talking about office problems. Offer to help by phoning the correct department. Use the words in the box to help you like this:

Unit 13 Product description 13.1 Comparing products (1)Vocabulary Match the adjectives in column to their opposites in column B like this:

Unit 12 Fairs and sales 12.1 Finding out about a trade fair (1)Listening and speaking Look at the advertisement for trade fairs. International Trade Fairs Travel and tourism fair

11.1 Finding someone a job (1)Grammar Complete this list of irregular verbs. Present Past simple Present Past simple

10.1 Grammar Fill in the correct form of the verb in (brackets. Use short forms where possible. Last week I (1) was (be) at fair in Munich, but my assistant (2)(not come) with me. She(3) (be)on holiday