Purposes 1. To get students know something about Valentihe's Day and how people celebrate it 2. To understand the purpose of writing 3. To reinforce some basic linguistic knowledge by doing various type of exercises

According to Say's Law, Supply Creates Its Own Demand as Prices move to balance Demand with Aggregate Supply

ECENOMIC S National Output Determines the Levels of Consumption and Saving

ECENOMIC S We Now Turn to Money: Its Demand and the Role of Banks in Its Supply

ECENOMIC S Business fluctuations have been a Persistent Feature of Capitalism

ECENOMIC S Gross domestic product can be measured Either as(a) a Flow of Final Products or Equivalently, as(b) a Flow of Costs 1-153

ECENOMIC S Lorenz Curve shows Income Inequality T137 Figure 19-1 100 Curve of absolute equality Deviation fror absolute equality

4.1 General introduction to ocean physics 4.2 Ocean current 4.3 Air-sea interaction 4.4 Climatic influence 4.5 Thermohaline circulation

例185.如图8-1所示,轮板零件的加工,毛坯用压板固定在机床工作台面上,材料为铝合 金,要求加工外轮廓和内孔,加工深度5m(粗加工)。 0176 N10 G55 LF TO1 DO1 MO6 LI G90S1000M03LF

例123:铣削凸台轮廓 N10G54G90G00Z200: N20T01M06 N40S1200M03 N50Z5M08 N60G42X0Y0