电流是如何形成的?它的方向是如何规定的?

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问题:

电流是如何形成的?它的方向是如何规定的?

考点:汽轮机检修汽轮机调速系统检修工(初级)汽轮机调速系统检修工(初级)题库
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净重栏应填( )。

A.18.90

B.15025

C.17951

D.不填

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阅读理解。

     Two hours from the tall buildings of Manhattan and Philadelphia live some of the world’s largest black bears. They are in northern Pennsylvania’s Pocono Mountains, a home they share with an abundance of other wildlife.

     The streams, lakes, meadows (草地), mountain ridges and forests that make the Poconos an ideal place for black bears have also attracted more people to the region. Open spaces are threatened by plans for housing estates and important habitats are endangered by highway construction. To protect the Poconos natural beauty from irresponsible development, the Nature Conservancy (大自然保护协会) named the area one of America’s “Last Great Places”.

     Operating out of a century-old schoolhouse in the village of Long Pond, Pennsylvania, the conservancy’s bud Cook is working with local people and business leaders to balance economic growth with environmental protection. By developing partnerships with people like Francis Altemose, the Conservancy has been able to protect more than 14,000 acres of environmentally important land in the area.

     Altemose’s family has farmed in the Pocono area for generations. Two years ago Francis worked with the Conservancy to include his farm in a county farmland protection program. As a result, his family’s land can be protected from development and the Altemoses will be better able to provide a secure financial future for their 7-year-old grandson.

     Cook owes the Conservancy’s success in the Poconos to having a local presence and a commitment to working with local residents.

     "The key to protecting these remarkable lands is connecting with the local community,"Cook said. “The people who live there respect the land. They value quiet forests, clear streams and abundant wildlife. They are eager to help with conservation effort.

     For more information on how you can help the Nature Conservancy protect the Poconos and the world’s other “Last Great Places,” please call 1-888-564 6864 or visit us on the World Wide Web at www.tnc.org.

1.The purpose in naming the Poconos as one of America’s “Last Great Places” is to ________.

A. gain support from the local community

B. protect it from irresponsible development

C. make it a better home for black bears

D. provide financial security for future generations

2.We learn from the passage that ________.

A. the population in the Pocono area is growing

B. wildlife in the Pocono area is dying out rapidly

C. the security of the Pocono residents is being threatened

D. farmlands in the Pocono area are shrinking fast

3.What is important in protecting the Poconos according to Cook?

A. The setting up of an environmental protection website

B. Support from organizations like The Nature Conservancy

C. Cooperation with the local residents and business leaders

D. Inclusion of farmlands in the region’s protection program

4.The passage most probably is ________.

A. an official document                  

B. a news story  

C. an advertisement                    

D. a research report

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税收管理机构的职责是什么?

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女性,23岁,工作时不慎长发被卷入机器中,头皮被整体撕脱,范围向前包括部分眼睑皮肤,后及枕部,双侧包括耳后皮肤和耳轮,伤后2小时被送入医院急诊科。

如撕脱之头皮碾挫不明显,创面修复时应首先考虑选择()

A.撕脱头皮去薄成断层皮片后完整回植

B.撕脱头皮去薄成断层皮片后行邮票状植皮

C.试行显微外科吻合残存动静脉回植头皮

D.弃用撕脱头皮,另取皮行整张植皮

E.头皮完整回植,不必吻合血管

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简述220~330kV变压器施加电压前变压器油的主要电气指标和标准。

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