问题 不定项选择

如图所示,两个垂直纸面的匀强磁场方向相反,磁感应强度的大小均为B,磁场区域的宽度均为a,一个正三角形导线框ADC(高为a)从图示位置沿图示方向匀速穿过两磁场区域,以逆时针方向为电流的正方向,则感应电流I与线框移动距离x的关系图像正确的是

[ ]

A.

B.

C.

D.

答案

答案:C

阅读理解

The Winter Olympics are also called the White Olympics. At this time, many colorful stamps are published (发行) to mark (标志) the great Games. The first stamps marking the opening came out on January 25, 1932 in the United States for the 3rd White Olympics. From then on, publishing stamps during the White Olympics became a rule.

During the 4th White Olympics, a set of stamps were published in Germany in November 1936. The five Olympics rings were drawn on the front of the sportswear. It was the first time that the rings appeared on stamps celebrating the White Olympics.

In the 1950's, the stamps became more colorful. When the White Olympics arrived, the host countries (东道国) as well as the non-host countries published stamps to mark the Games. China also published four stamps in February 1980, when Chinese sportsmen began to take part in the White Olympics.

Japan is the only Asian country that has ever held the White Olympics. Altogether 14,500 million stamps were sold to raise (筹集) money for this sports meeting.

Different kinds of sports were drawn on these small stamps. People can enjoy the beauty of the wonderful movements of some sportsmen.

小题1:The White Olympics and the Winter Olympics are different games.

小题2:The Winter Olympics are held every four years。

小题3:Only the host countries can publish stamps to mark the Games.

小题4:In November 1936,the five Olympics rings were first drawn on the front of  the sportswear.

小题5:Japan is the only Asian country that has ever held the White Olympics.

问答题 简答题