“The best things in life are free. . . ” Free goods provide a special challenge for economic analysis Most goods in our economy are allocated in markets… …for these goods, prices are the signals that guide the decisions of buyers and sellers

The Law of Supply: uFirms are willing to produce and sell a greater quantity of a good when the price of the good is high. uThis results in a supply curve that slopes upward

The Meaning of Competition uA perfectly competitive market has the following characteristics: u There are many buyers and sellers in the market

Monopoly While a competitive firm is a price taker, a monopoly firm is a price maker

Imperfect Competition Imperfect competition refers to those market structures that fall between perfect competition and pure monopoly

Harcourt, Inc. items and derived items copyright © 2001 by Harcourt, Inc. The Four Types of Market Structure Monopoly Oligopoly Monopolistic Competition Perfect Competition

Factors of Production Factors of production are the inputs used to produce goods and services

水稻侵染性病害( Rice infection disease)全世界报道近200种,其中真菌病害 140余种,细菌病害12种,病毒及类菌原体病害22种以及与水稻有关的寄生线 虫30余种。中国已发现的真菌病害50余种,细菌病害6种,病毒及类菌原体 11种,线虫病害4种。在辽宁和吉林省已发现侵染性病害有20多种,但在黑龙 江省只发现10余种。全世界引起巨大损失的主要有稻瘟病、纹枯病、稻白叶枯 病和东格鲁病。据估计,全世界水稻每年因病害造成的产量损失平均约为10% 15%

1.设计步骤 (1)建立原始状态表和状态图 原始的含义:是指没有经过简化而获得的状态转移表和状态转移图

1．1 计算机的定义和特性 1．2 计算机的发展历程 第2章 数据的表示 •本章讨论在计算机内部各类基本数据的表示方法及其相互间的等值转换。 第3章 运算器与运算方法 ● 运算器部件是计算机中的执行部件，它可以对二进制数据进行各种算术和逻辑运算； • 运算器也是计算机内部数据信息的重要通路。 ● 本章重点介绍运算器的核心部件——算术逻辑运算单元ALU的组成与工作原理，以及数据在运算器的基本运算方法