一、世界经济贸易地理学科的性质 世界经济贸易地理属于综合性学科(边缘学科): 地理学的分支:地理学→人文地理学→经济地理学→

一、煤层厚度变化对煤矿生产的影响: 1.影响采掘部署 2.影响计划生产 3.掘进率增高 4.回采率降低

尖晶石、碧玺、黄玉、橄榄 石、锆石、石榴石、长石

一、前言 二、波的基本概念 三、平面简谐波方程 四、波动方程与波速 五、平均能流密度·声强与声压 六、波的叠加和千涉·驻波 七、多普勒效应

翡翠鉴赏概述 一、研究翡翠的意义; 二、翡翠是什么? 三、翡翠主要特征; 四、翡翠ABC货及赝品 五、翡翠的评价

INTRODUCTION TO STEREOGRAPHIC PROJECTIONS Basic principles Basic procedures Exercise in class

hinge lines axis A axial plane axial surface B (imaginary) Axis axial plane and axial surface

Classification of folds (continue) Based on four main features or properties: 1 direction of closing and facing 2 attitude of axial surface 3 size of inter-limb angle, and 4 shape of profile 5 dip isogons

hangingwall ramp A- Ramps and flats hangingwall B-Hangingwall ramp and footwall footwall ramp footwall ramp B C-? thrust sequence New thrusts develop in the footwall

Extensional Fault Systems A- Evolutionary model illustrating progressive extension accommodated by block rotation above a low-angle extensional fault. B-Listric fault with hangingwall rollover anticline. Area and B are equal. C-Flat/ramp geometry of fault produces geometrically necessary folding in hangingwall