要铺设一条 A1 → A2 →→ A15 的输送天然气的主管道, 如图 1 所示(见反 面).经筛选后可以生产这种主管道钢管的钢厂有 1 2 7 S S S , , , .图中粗线表示铁 路，单细线表示公路，双细线表示要铺设的管道(假设沿管道或者原来有公路，或 者建有施工公路)，圆圈表示火车站，每段铁路、公路和管道旁的阿拉伯数字表示 里程(单位：km)

1 某种电动机启动后转速随时间变化 的关系为 ，式中 ， τ= 2.0s．求：(1)t =6.0s时的转速；(2)角加 速度随时间变化的规律；(3)启动后内6.0s 转过的圈数．

§13-1 概述（Introduction) §13-2 杆件变形能的计算( Calculation of strain energy for various types of loading ) §13-3 互等定理（Reciprocal theorems) §13-4 单位荷载法 • 莫尔定理(Unit-load method & mohr’s theorem) §13-5 卡氏定理(Castigliano’s Theorem) §13-6 计算莫尔积分的图乘法 (The meth￾od of moment areas for mohr’s integration)

《翻译与思辩》参考资料：Topic 3 Nuclear Energy_A Beginner's guide to Nuclear Power

复旦大学：《学术英语（管理科学）Academic English for Business》学术英语综合素养教学课件_Unit 3 Corporate strategies Text A Wal-Mart’s foreign expansion

1. Overview 1. World café market 2. History 3. What is Starbucks 4. Company’s figure 5. Business model 6. Marketing strategy 3 Starbacks 2. Analysis 1. SWOT 2. Chinese market 3. Starbucks in China 4. Competitors 5. Obstacles 6. Future plan

Section A Five Famous Symbols of American Culture Section B Engelbreit's the Name,Cute is My Game Section C Life in Low-Grade Terror

《复合材料 Composites》课程教学资源（学习资料）第二章 增强体_glass fiber-5 Mid-IR luminescence of Dy3t and Pr3t doped Ga5Ge20Sb10S（Se）65 bulk glasses and fibers

2 Introduction 3 Basic Advice 4 Do’s and Don’ts 5 Lashing Systems 7 Safe Working 8 Ships and Containers 13 Container Construction 17 Lashing Components 22 Principles of Stowage 31 Ships’ Behaviour

复旦大学：《大学物理》课程教学资源（PPT课件，英文）Chapter 3 Force and Newton’s laws