下表为某电热水壶铭牌上的一部分内容．根据表中的信息，可计算出在额定电压下以额定功率工作时通过电热水壶的电流约为（ ）
| 型 号 | SP-988 | 额定功率 | 1500W |
| 额定电压 | 220V | 额定容量 | 1.6L |
A．0.15A
B．0.23A
C．4.4A
D．6.8A
由表格读出，电热水壶的额定电压U=220V，额定功率P=1500W，由公式P=UI得，I=
=P U
A≈6.8A1500 220
故选D
| Losing a job or not being able to find one almost always brings unwelcome changes. If you’ve lost a job, the first feeling is often one of shock. On top of the loss of income, many people find the whole routine of their life is shattered, their contact with other people reduced, their ambitions halted and their identity as a worker removed. There may be good feelings too -- it’s nice to be able to lie in bed in the morning, to spend more time with children, or to have more time to think -- a better job may be just around the comer. But, unless a better job does turn up, chances are the days start getting longer and the time becomes harder to fill. Many people pass through periods of difficulty in sleeping and eating. They feel irritable and depressed, often isolated and lonely. Despite all these problems, unemployment can be a chance for a fresh start. You can discover that it provides an opportunity to sort out or rethink what you want from life and how best you can get it. You can use the time to plan how to find a new job, learn a new skill, develop your hobbies, see if you can run your own business, do some voluntary work in your community or meet new people. It’s up to you. |
The author’s purpose is to ______.
A．give the basic facts of unemployment
B．explain the reasons of unemployment
C．introduce new jobs to the unemployed
D．offer encouragement to the unemployed
