§3-1 概述 一、 振荡器的功能 二、 振荡器分类 三、反馈振荡器的含义与用途 §3-2 反馈振荡器的工作原理 一、构成框图 二、工作原理 : 包括 平衡条件起振条件 §3-4 晶体振荡器 §3-3 LC正弦波振荡器 一、 变压器反馈式振荡器 二、 三点式振荡器 三、差动对管振荡器 四、改进型电容三点式振荡器 五、频率稳定 §3-5 RC正弦波振荡器

1、太平天国运动爆发的原因 2、太平天国运动的历史意义 3、太平天国运动的失败原因

§10-1 互感 §10-2 含有耦合电感电路的计算 §10-3 耦合电感的功率 §10-4 变压器原理 §10-5 理想变压器

1.发动机基本结构及术语 2.四冲程汽油发动机工作原理 3.发动机总体构造及编号规则

Every field of study has its own terminology Mathematics axioms integrals vector spaces Psychology

Economy. . . . . . The word economy comes from a Greek word for “one who manages a household

Harcourt, Inc. items and derived items copyright © 2001 by Harcourt, Inc. Interdependence and Trade Consider your typical day: You wake up to an alarm clock made in Korea. You pour yourself some orange juice made from oranges grown in Florida. You put on some clothes made of cotton grown in Georgia and sewn in factories in Thailand. You watch the morning news broadcast from New York on your TV made in Japan

The Market Forces of Supply and Demand Supply and demand are the two words that economists use most often. Supply and demand are the forces that make market economies work. Modern microeconomics is about supply, demand, and market equilibrium

Elasticity . . . … is a measure of how much buyers and sellers respond to changes in market conditions … allows us to analyze supply and demand with greater precision

In a free, unregulated market system, market forces establish equilibrium prices and exchange quantities. While equilibrium conditions may be efficient, it may be true that not everyone is satisfied