问答题简答题：变压器二次熔丝熔断，一般是由哪些原因引起的？

题型：问答题

从离地面高500m的高空中自由下落一个小球，取g=10m/s²，求：①小球经过多长时间落到地面？②落到地面的速度？③最后1s内下落的高度？

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题型：阅读理解

Astronauts’ meals have come a long way from the free-dried powders and semi—liquid pastes of decades ago，now US scientists want to grow vegetables in mini—greenhouses on the moon．
Scientists say they are looking forward to a time when residents of future lunar or even Martian outsteps will be able to dine on fresh vegetables．Paragon Space Development Corporation has unveiled what it called the first step toward growing flowers——and eventually food on the moon．
This is a sealed greenhouse that looks like a bell jar encased in a 46-cm triangular aluminiumframe．It is designed to safely land a laboratory plant on the lunar surface，and protect it while it grows．
The miniature greenhouse is to be launched into space by Odyssey Moon Ltd, a participant in the Google Lunar X Prize. This competition offers $21 million to any entrant who can launch, land and operate a rover on the lunar surface.
Paragon officials say future testing of the “Lunar Oasis” will be driven by Odyssey’s flight Schedule, which will not happen until 2012 at the earliest．
When it does lift off the greenhouse will contain the seeds of Brassica, a hardy plant related to Brussels sprouts and cabbage. Because Brassica goes from seed to flower in just 14 days, it can complete its life cycle in a single lunar night.
“Colonizing the Moon or Mars seems so far away，but it is important that we do this research now. ”Paragon president Jane Poynter said．
“It takes a long time to get a lot of research, and to get integrated, reliable efficient systems before colonists move in. ”she said．
小题1:The article is written mainly to__________．

A．predict the astronauts’ meals in the future

B．introduce an experiment “Lunar Oasis’’

C．tell us the future development of astronomy

D．focus on the human’s great progress

小题2:The article implies that__________．

A．astronauts can grow flowers in space at present
B．Paragon and NASA will carry out the test separately
C．Lunar Oasis is a series of experiments carried out in space	D．the earliest testing of the Lunar Oasis may be in 2012

小题3:The underlined word “colonists” in the last paragraph probably has the meaning of______．

小题4:The seeds of Brassica will be contained in the greenhouse mainly because _________.

A．their life cycle is much shorter

B．they are more nutritious than other food

D．they are very delicious

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题型：判断题

视神经缺损多为单眼发病，视力明显低下。

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题型：阅读理解

阅读理解。

Handbags are one of the signature statements for every fashion conscious woman. Lauren Bush and Ellen

Gustafson have managed to turn this accessory into a necessity in the struggle to feed the world's hungry

children, one handbag at a time. "There's no other choice," Gustafson said. "We have to help them get into

school. That's the only choice we have."

The pair met four years ago through their work with the United Nations. What they saw inspired the launch

of their collection FEED.

Their first bag, a $ 60 reusable shopping one, provides a school meal for a child anywhere in the world for

an entire a year, "World hunger seems so far away and so overwhelming (势不可挡的) for most people," Bush

said."So to know exactly what you're doing is great."

FEED now has a dozen styles in some of New York's most popular stores. Prices range from $ 15 to $ 195.

The cost varies because each bag provides help in a different way and says so right on the back.

When the earthquake hit Haiti, FEED designed the "FEED Haiti 50" bag. It provides 50 school lunches for

children there. "That meal that a child gets in school is almost certainly the only proper meal that they get

everyday," said Marcus Prior, UN spokesperson in Haiti.

Every year hunger and malnutrition kill more people in developing nations than AIDS, malaria, and

tuberculosis combined. That's 3 million children who never make it to their fifth birthday. 300 million other

children go to bed hungry every night.

Since 2007, FEED has donated $ 5. 5 million to the UN World Food Program. "Hunger is a very terrible

feeling, it's a very terrible way to die," Gustafson said. "To know that just through selling a product we can

help them get the most essential to human life-food to thrive-is very powerful."

1. What's the purpose of the launch of FEED?

A. To help the hungry children.

B. To recycle the waste handbags.

C. To promote the sales of handbags.

D. To make all the children receive a good education.

2. Which of the following is True about the FEED handbag?

A. It has only one style.

B. Its price stays the same.

C. It is popular with lots of women.

D. The help it offers is marked on the back.

3. From what Gustafson said in the last paragraph, we can infer that ____.

A. she was afraid of dying from hunger

B. she was proud of what they did

C. she had ever suffered hunger

D. she called on people to help the hungry

4. The underlined word "malnutrition" in the sixth paragraph probably means ____.

A. poor nutrition

B. depression

C. balanced diet

D. super nutrition

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题型：多项选择题

职工代表在任期内出现（）情况时，原选举单位职工有权撤换。

A.任期内的职工代表在企业内部调动工作的

B.被依法剥夺政治权利或被企业开除的

C.无故不参加职工代表大会活动，严重失职的

D.停薪留职长期病事假、脱产学习等情况，不能参加职工代表大会各项活动的

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变压器二次熔丝熔断，一般是由哪些原因引起的？

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