§1-1 材料力学的任务及研究对象(The tasks and research objects of mechanics of materials) §1-2 变形固体的基本假设(The basic assumptions of deformable body ) §1-3 力、应力、应变和位移的基本概念 ( Basic concepts of force、stress、 strain and displacement) §1-4 杆件变形的基本形式 (The basic forms of deformation)

§8-1组合变形和叠加原理 (Combined deformation and superposition method) §8-2拉伸(压缩)与弯曲的组合 (Combined axial and flexural loads) §8-3偏心拉(压)截面核心(Eccentric loads &the kern (or core) of a section) §8-4扭转与弯曲的组合 (Combined torque and flexural loads)

§3-1 扭转的概念和实例 (Concepts and example problem of torsion) §3-2 扭转内力的计算 (Calculating internal force of torsion) §3-3 薄壁圆筒的扭转 (Torsion in thin—wall circular tube) §3-4 圆轴扭转的应力分析及强度条件 (Analyzing stress of circular bars & strength condition) §3-8 开口和闭合薄壁截面杆的自由扭转 (Free torsion of open and closed thin￾walled members) §3-5 圆杆在扭转时的变形 ·刚度条件 (Torsional deformation of circular bars & stiffness condition) §3-6 密圈螺旋弹簧的应力和变形 (Calculation of the stress and deformation in close-coiled helical springs) §3-7 非圆截面杆的扭转 (Torsion of noncircular prismatic bars)

§12–1 非对称弯曲 (Unsymmetrical bending ） §12–2 开口薄壁杆件的切应力 弯曲中心 (Shear stress of open thin-wall members. Flexural center) 第十二章 弯曲的几个补充问题 (Additional remarks for bending）

§5-1 引言 ( Introduction) §5-2 纯弯曲时的正应力 (Normal stresses in pure beams ) §5-3 横力弯曲时的正应力(Normal stresses in transverse bending ) §5-4 梁的切应力及强度条件 (Shear stresses in beams and strength condition) 第五章 弯曲应力(Stresses in beams) §5-5 提高梁强度的主要措施（Measures to strengthen the strength of beams)

§4-1 基本概念及工程实例 (Basic concepts and example problems) 第四章 弯曲内力 (Internal forces in beams) §4-3剪力方程和弯矩方程·剪力图和弯矩图 (Shear-force& bending-moment equations ; shear-force & bending- moment diagrams) §4-2 梁的剪力和弯矩(Shear- force and bending- moment in beams) §4-6 平面刚架和曲杆的内力图 (Internal diagrams for frame members & curved bars) §4-5 叠加原理作弯矩图 (Drawing bending-moment diagram by superposition method) §4-4 剪力、弯矩与分布荷载集度间 的关系(Relationships between load,shear force,and bending moment)

7-1应力状态概述 (Concepts of stress-state) 7-2平面应力状态分析-解析法 (Analysis of plane stress-state) 7-3平面应力状态分析-图解法 (Analysis of plane stress-state) 7-4三向应力状态分析 7-5平面应变状态分析 (Analysis of plane strain-state) 7-6广义胡克定律 (Generalized Hook's law) 7-7复杂应力状态的变形比能 (Strain-energy density in general stress-state 7-8强度理论(Failure criteria) 7-9莫尔强度理论 (Mohr's failure criterion)

Of the three groups of biopolymers, protein have the most diverse function. Most of its molecular weights are much larger. Their shaps cover a range from the globular protein to the helical coils of a α–keratin. But all proteins have common features. Proteins are polyamides and their monomeric units are about 20 different α-amino acids

The important of acid-base reaction: 1. is a simple, fundamental reaction. 2. enable you to see the mechanism of the reaction 3. illustrate the process of bond breaking and bond making 4. examine important ideas about the relationship between the structure of molecules and their reactivity

Chapter 6 Ionic Reactions--- Nucleophilic substitution and elimination reactions of alkylhalides (卤代烃的亲核取代反 Because halogen atoms are more electronegative 应和消除反应） than carbon, the carbon-halogen bond of alkyl halides is polarized; the carbon atom bears a partial positive charge, the halogen atom a partial negative charge