一、罐头杀菌的目的和要求杀菌程度：杀灭腐败菌、致病菌、产毒菌。并不要求绝对无菌，允许活菌存在，但不引起腐败、致病、产毒。这与微生物灭菌在程度上不同。 原因：尽量减少加热杀菌对食品色香味形带来的不利影响

思考题: 1、汽车发动机有哪些类型? 2、四冲程往复活塞式内燃机通常有哪些机构与系统组成?他们各有什么功用 3、四冲程汽油机和柴油机在基本工作原理上有何异同

第一节 呼吸的过程和呼吸器官 第二节 肺通气原理 第三节 气体交换和运输 第四节 呼吸的调节 重点: 肺通气、肺换气原理、气体运输 难点： 呼吸的调节

◼ 第一节 会计目标 ◼ 第二节 会计前提 ◼ 第三节 会计原则 ◼ 第四节 会计要素 ◼ 第五节 会计等式

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