一矩形线圈位于一随时间t变化的匀强磁场内,设磁场方向垂直线圈所在的平面(纸面)向

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问题:

一矩形线圈位于一随时间t变化的匀强磁场内,设磁场方向垂直线圈所在的平面(纸面)向里为正,如图1所示,磁感应强度B随t的变化规律如图2所示。以i表示线圈中的感应电流,以图1中线圈上箭头所示方向的电流为正,则以下的i-t图中正确的是

[ ]

A.

B.

C.

D.

考点:感应电流
题型:不定项选择

Almost every Chinese person can recite(背诵) the two lines of the famous poem, “Every grain on the plate comes from hard work ”. But sadly, many of us don’t actually get the real meaning of these lines: Don’t waste food.

A CCTV program reported that the food Chinese people throw away every year is enough to feed 200 million people for a year. Do we have too much food? Absolutely not. According to the UN World Food Program, there were 925 million hungry people around the world in 2011, especially in developing countries. Six million children die of hunger every year.

Chinese people are well-known for being friendly and generous. Many even feel that they lose face if their guests have eaten all the food on the table. Luckily, a number of people have realized the importance of saving food. What should we do in our daily lives to waste less food?

1. Don’t order too much in a restaurant. Only order as much as you want to eat. If you cannot eat all the food you ordered, take the rest of it home.

2. Don’t leave any food in your bowls while having meals.

3. Keep an eye on what food you have at home. Don’t buy too much, especially for vegetables and fruit.

小题1:What’s the real meaning of the underlined sentence?

A.春种一粒粟,秋收万颗籽

B.谁知盘中餐,粒粒皆辛苦。

C.吏禄三百石,岁晏有余粮

D.足蒸暑土气,背灼炎天光。小题2:According to the UN report, how many hungry people were there in 2011?

A.6 million.

B.925 million.

C.200 million.

D.725 million.小题3:What should we do to waste less food?

A.Order more food in a restaurant.

B.Every time you eat, leave some food in your bowls.

C.Take all the food you ordered home.

D.Don’t store too much food like vegetables and fruit.小题4:Which of the following is NOT true?

A.A number of people have realized the importance of saving food.

B.The food Chinese people throw away every year is enough to feed 200 million people for a year.

C.200 million children die of hunger every year.

D.Many Chinese feel that they lose face if guests have eaten all the food on the table.小题5:What’s the main idea of this passage?

A.Don’t waste food.

B.Chinese people are friendly and generous.

C.We can’t die of hunger.

D.Every grain is grown by farmers.

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8.8888是循环小数。[ ]

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城市规划管理是一项()很强的行政管理工作。

A.规范性

B.技术性

C.科学性

D.强制性

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表面式空气热湿交换器可进行三种空气处理过程,下列选项正确的是______。

A.等湿加热、等湿冷却、绝热加湿
B.等湿冷却、绝热加湿、减湿冷却
C.减湿冷却、等湿加热、等湿冷却
D.减湿冷却、等温减湿、等湿冷却

题型:不定项选择

阻塞性窒息死系指()。

A.勒死

B.活埋

C.捂死

D.扼死

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