一、钻石是什么? 金刚石(Diamond)与钻石 它的硬度极大(摩氏硬度10),是最硬的物质 ;有一定的晶形,一般为八面体(见图1);灿 烂夺目,五彩缤纷;自然界产出极为稀少(每 开采250吨矿石才能有1ct宝石级金刚石):因 此它最符合宝石的四条标准,即:自然产出 ;耐久(广告词有“钻石恒久远,一颗永流传”) ,硬度大,不磨损;美观;稀少。不愧有“宝 石之王”的美称

《世界经济与政治》：“联盟与战争”：冷战时代的中国战略决策及其后果（北京大学国际关系学院：牛军）

北京大学中国战略研究中心：中美在西太平洋的军事竞争与战略平衡（胡波）

5.4 Land degradation--Soil erosion (1) Types of land degradation (2) Classification of soil erosion (3) Climate and soil erosion (4) Soil erosion models (5) Erosion and productivity (6) Rainfall factor for soil erosion model

Chap. 4 Climate/Change and Water Resources Quantity assessment of water resources Available water resources Supplying water resources Water resources requirement Quality assessment of water resources Impacts of climate changes on water resources

3.4 Crop growth and its modeling 3.4.1 Components of plant growth 3.4.2 Empirical models 3.4.3 Process-based models 3.4.4 Case studies

Content Chap.1 Introduction Chap. 2 Background knowledge-Climate Change Chap. 3 Climate/change and agriculture Chap. 4 Climate/change and water resources Chap. Climate/change and land resources Chap. 6 Climate/change and disasters

Chapter 2 Chap. 2 Climate and Its Change -Background Knowledge 2.1 Climate and climate system 2.2 Climate changes 2.3 Climate models and its applications Date Assessment of climate/change impacts

R30 Model One of the simulations conducted as part of the GFDL-University Consortium project is a 17 year simulation in which the lower boundary conditions repeat the mean seasonal cycle. Attributes of the model simulation are given below

Climate change output CSIRO Atmospheric Research Technical Paper No 37, 1998 Kevin J. Hennessy Contents Abstract Global climate models Regional climate models CsiRo climate models