外研版（三起）（2012）小学英语四年级下册Module 9 Unit 2 Did you have a nice holiday$%Module 9 Unit 2 Did you have a nice holiday$%课件(2)

外研版（三起）（2012）小学英语四年级下册Module 9 Unit 2 Did you have a nice holiday$%Module 9 Unit 2 Did you have a nice holiday$%课件(1)

【本章重点】本章重点掌握计算机系统并行通信的概念；并行接口Intel8255A的结构功能、三种工作方式和应用。【本章难点】难点是并行接口Intel8255A的工作方式选择及特点，8255A与8086系统的连接应用

外研版（三起）（2012）小学英语四年级下册Module 9 Unit 2 Did you have a nice holiday$%Module 9 Unit 2 Did you have a nice holiday$%教案

外研版（三起）（2012）小学英语四年级下册Module 9 Unit 2 Did you have a nice holiday$%Module 9 Unit 2 Did you have a nice holiday$%教案(4)

外研版（三起）（2012）小学英语四年级下册Module 9 Unit 2 Did you have a nice holiday$%Module 9 Unit 2 Did you have a nice holiday$%教案(3)

1.A Nucleic Acid Consists of Four Kinds of Bases Linked to a Sugar-Phosphate Backbone 2.A Pair of Nucleic Acid Chains with Complementary Sequences Can Form a Double￾Helical Structure 3.DNA Is Replicated by Polymerases That Take Instructions from Templates

Definition of a project and its attributes Key constraints within which a project must be managed How a project is “born” Life of a project Steps involved in the project management process Implications of global project management Benefits of project management

重点考察了Ti合金化过程中影响Ti收得率的主要因素,并对比分析了Ti合金化前后夹杂物的物相变化及夹杂物的去除效果.控制氧活度a[O]85%;当a[O]>350×10-6时,需控制Al、Ti合金加入时间间隔为5 min以上.相同a[O]和[Al]s情况下,延长Al、Ti加入时间间隔可以有效提高Ti收得率.RH处理过程中,钢包内当量直径>200μm的Al2O3夹杂物在5 min内基本可以上浮去除,但相同尺寸的A-Ti-O复合夹杂的去除时间要比Al2O3长1~2 min.Ti合金加入后,Al2O3夹杂物周围会形成Al-Ti-O的复合夹杂,这些夹杂物的形成降低Ti的收得率

外研版（三起）（2012）小学英语四年级下册Module 9 Unit 2 Did you have a nice holiday$%Module 9 Unit 2 Did you have a nice holiday$%教案(2)