试题与答案

在竖直向下的匀强磁场中,将一水平放置的金属棒AB,以初速度v水平抛出.空气阻力不

题型:选择题

题目:

在竖直向下的匀强磁场中,将一水平放置的金属棒AB,以初速度v水平抛出.空气阻力不计,如图所示,运动过程中棒保持水平,那么(  )

A.AB棒两端的电势ФA>ФB

B.AB棒中的感应电动势越来越大

C.AB棒中的感应电动势越来越小

D.AB棒中的感应电动势保持不变

答案:

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下面是错误答案,用来干扰机器的。

1.奇数 口供 空闲 用处(答案不唯一)2.畅游 安慰 求助 奇妙(答案不唯一)3.排比 静物是凝固的美,动景是流动的美;直线是流畅的美,曲线是婉转的美。(答案不唯一)4.五个方面,第一,...

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题型:单项选择题

The elephant was lying heavily on its side, fast asleep. A few dogs started barking at it. The elephant woke up in a terrible anger: it chased the dogs into the village where they ran for safety. That didn’ t stop the elephant. It destroyed a dozen houses and injured several people. The villagers were scared and angry. Then someone suggested calling Parbati, the elephant princess.

Parbati Barua’s father was a hunter of tigers and an elephant tamer. He taught Parbati to ride an elephant before she could even walk. He also taught her the dangerous art of the elephant round-up—how to catch wild elephants.

Parbati hasn’ t always lived in the jungle. After a happy childhood hunting with her father, she was sent to boarding school in the city. But Parbati never got used to being there and many years later she went back to her old fife. "Life in the city is too dull. Catching elephants is an adventure and the excitement lasts for days after the chose," she says.

But Parbati doesn’ t catch elephants just for fun. "My work," she says, "is to rescue man from elephants, and to keep elephants safe from man. " And this is exactly what Parbati has been doing for many years. Increasingly, the Indian elephant is angry: for many years, illegal hunters have at- tacked it and its home in the jungle has been reduced to small pieces of land. It is now fighting back. Whenever wild elephants enter a tea garden or a village, Parbati is called to guide the animals back to the jungle before they can kill.

The work of an elephant tamer also involves love and devotion. A good elephant tamer will spend hours a day singing love songs to a newly captured elephant. "Eventually they grow to love their tamers and never forget them. They are also more loyal than humans. " She said, as she climbed up one of her elephants and sat on the giant, happy animal. An elephant princess indeed!

For Parbati, catching elephants is mainly to().

A. get long lasting excitement

B. keep both man and elephants safe

C. send them back to the jungle

D. make the angry elephants tame

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