Save the Energy Resources Another round of energy crisis is knocking at the door. In 2004, world oil consumption reached a new record, causing oil price in the international market to skyrocket amazingly. As for China, it was reported that many traditional mineral cities in northeastern China had run into predicament, with their economy collapsed and workers unemployed, only because coal had been mined out. Fossil energy resources, including coal, oil and gas, are unlike sunlight, water power and wind power which are generated consistently. They re not practically reproductive during human history. Once consumed, they re gone forever. If they were to be exhausted before we could find sufficient reproductive resources to replace them with, we d have to live in entire blackout again like our ancestors have done thousands of years ago. That s of course not what anyone would want to see. Due to technical limitations, people still have to utilize these resources now. As a result, we must economize them most cleverly. New techniques should be developed and applied to reduce energy cost in industry and daily life. Alternative energy should be employed wherever possible. Eradicate any practice that wastes energy. Humans have overcome so many crises in history, and we re sure to win this time also.
GRE数学疑难问题解答思路
GRE数学备考经验介绍
新gre数学考点介绍:Linear Equation of One Variable
新gre数学考点介绍:Multiple Times
GRE数学数据解释题型重点试题(五)
新gre数学考点介绍:并集和交集
新gre数学考点介绍:Coefficient
GRE数学考试题型和形式介绍
新GRE数学疑难问题列举解答
新gre数学考点介绍:set、排列、组合
新gre数学考点介绍:AP
新gre数学考点介绍:Substitution
推荐GRE数学复习要点:几何
GRE数学数据解释题型重点试题(三)
新gre数学常用表达公式
新GRE数学考点:Set
新GRE数学词汇汇总:S—Z
新gre数学考点介绍:Mode
新gre数学考点介绍:Sequence of Numbers
推荐GRE数学复习要点:算术
GRE数学词汇:代数式、方程和不等式
新GRE数学:易错题整理
新gre数学考点介绍:Evaluating Expressions
GRE数学的备考经验分享
新gre数学考点介绍:Set
新gre数学考点:Substitution
新gre数学备考经验分享
新gre数学考点介绍:Solve Equation of One Variable
新gre数学考点介绍:AT least One
新gre数学考点介绍:At Least Once
| 不限 |
| 英语教案 |
| 英语课件 |
| 英语试题 |
| 不限 |
| 不限 |
| 上册 |
| 下册 |
| 不限 |