问题 解答题

近年来,太阳能技术运用的步伐日益加快,已知2002年全球太阳能年生产量为670兆瓦,年增长率为34%.在此后的四年里,增长率以每年2%的速度增长(例如2003年的年生产量增长率为36%)

(1)求2006年的太阳能年生产量(精确到0.1兆瓦)

(2)已知2006年太阳能年安装量为1420兆瓦,在此后的4年里年生产量保持42%的增长率,若2010年的年安装量不少于年生产量的95%,求4年内年安装量的增长率的最小值(精确到0.1%)

答案

(1)由已知得2003,2004,2005,2006年太阳电池的年生产量的增长率依次为36%,38%,40%,42%.

则2006年全球太阳电池的年生产量为670×1.36×1.38×1.40×1.42≈2499.8(兆瓦).

(2)设太阳电池的年安装量的平均增长率为x,则

1420(1+x)4
2499.8(1+42%)4
≥95%.解得x≥0.615.

因此,这四年中太阳电池的年安装量的平均增长率至少应达到61.5%.

改错题

此题要求改正所给短文中的错误。对标有题号的每一作出判断:如无错误,在该行右边横线上画一个勾(√);如有错误(每行只有一个错误),则按下列情况改正:

该行多一个词:把多余的词用斜线(\)划掉,在该行右边横线上写出该词,并也用斜线划掉。

该行缺一个词:在缺词处加一个漏字符号(∧),在该行右边横线上写出该词。

该行错一个词:在错的词下划一横线,在该行右边横线上写出改正后的词。

注意:原行没有错的不要改。

Eddie liked music very much. After leaving in                     小题1:__________

a medical college he went to work in hospital.                     小题2:_________

There he found that a lot of patient were happier                   小题3:_________

and caused little trouble if pleasant music was                     小题4:__________

playing to them. So, when he began to work in his                  小题5:__________

office he had a recorder playing beautiful music

to keep his patients happy. A morning soon after                    小题6: __________

the recorder has been played, a woman, who was                   小题7:_________

sitting in the crowded waiting room, she complained,                 小题8:__________

“We’re all waiting here to see the doctor                          小题9:_________

while he just playing the violin in his office                        小题10:_________

instead of doing his medical work.”

单项选择题