一、曲线的投影特性 P147图6-3 二、圆的投影 P148图6-5 三、圆柱螺旋线 P149图6-7

7-1建筑形体的画法 一、表达方案选择 1.形体分析 2.确定安放位置 3.确定投影数量

一、建筑立面图的形成:P286

东南大学远程教育：《结构设计原理》课程教学资源（PPT课件讲稿，共八十讲，曹双寅、舒赣平）

2.5 Indices of crystal planes and directions I What's crystal planes anddirect ions? The atomic planes anddirections passing through the crystal arecalled(crystal) planes and directionsrespectively

4. Rule for elongation or reduction of R D All R.D. in the region where K1 and K2 makes an obtuse(acute) angle will increase (reduce) its length after twinning

1. The structure of am b differs from those of either a or B 2. Its composition is variable to more or lessextension 3. Mixed bonding 4. Intermediate properties

1. The cause of rotation: Due to constraints, or boundary conditions imposed on the crystal. ll. The rule of rotation:

1. There have no two-phases area in diffusion area, every layer is single-phases 2. Phase's interface moves according to parabola law 3. Phase's width

6. 8 Diffusion Mechani sm Flick's' law in microscopic form 1. One dimensional diffusion. jump frequency period probability of atom jumping to nearest position