简述三相异步电动机要求电压的正常范围是多少?

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问题:

简述三相异步电动机要求电压的正常范围是多少?

考点:供水工考试中级供水工中级供水工题库
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用四舍五入法对数5664935取近似值,保留三个有效数字,结果是(  )

A.566

B.5660000

C.5.66×106

D.5.67×106

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Mike resembles his mother in appearance _____ his personality follows his father's.

A.who

B.which

C.while

D.where

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■United States Capitol

It serves as the seat of government for the US Congress. It is located in Washington, D. C., on top of Capitol Hill at the eastern end of the National Mall. Officially, both the east and west sides of the Capitol are referred to as “fronts”. Historically, however, the east front was initially the side of the building intended for the arrival of visitors and famous guests.

Phone: (202) 225-6827

Official website: www.aoc.gov

Hours: Monday-Saturday: 9:00 a.m.-4:30 p.m.

■International Spy Museum

It is a privately owned museum dedicated to the field of espionage located in Washington. D. C., The museum was built by The Malrite Company at a cost of US $ 40 million. Despite being one of the few museums in Washington that charges admission fees, it has been popular since its opening in July 2002.

Phone: (202) 393-7798

Official website: www.spymuseum.org

Hours: Monday-Sunday: 9:30 a.m.-6:00 p.m.

■National Museum of Natural History

It is a natural history museum administered by the Smithsonian Institution, located on the National Mall in Washington, D.C., Admission is free and the museum is open 364 days a year. The museum’s collections total over 125 million specimens of plants, animals, fossils, minerals, rocks, meteorites(陨石),and human cultural artifacts, making it the largest such museum anywhere. It is the second most popular of all of the Smithsonian museums and is also home to about 185 professional natural history scientists—the largest group of scientists dedicated to the study of the natural and cultural history in the world.

Phone: (202) 633-1000

Official website: www.mnh.si.edu

■Jefferson Memorial

It is a presidential memorial in Washington, D. C., dedicated to Thomas Jefferson, an American Founding Father and the third president of the United States. The neoclassical building was designed by John Russell Pope. It was built by Philadelphia contractor John Mc. Shain. Construction began in 1939, the building was completed in 1942, and the bronze statue of Jefferson was added in 1947. When completed, the memorial occupied one of the last significant sites left in the city.

Phone: (202) 426-6821

Official website: www.mps.gov/thje

小题1:Which admission is free?

A.United States Capitol

B.Jefferson Memorial

C.International Spy Museum

D.National Museum of Natural History小题2: Visitors can learn more about ________ in the Jefferson Memorial.

A.the third American president

B.the US government

C.rock collections

D.natural history小题3:Where does this text probably come from?

A.A science textbook

B.A tourist guide

C.A museum guide

D.A history report

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区域市场发展规划以三个步骤开展,正确的顺序()。

A、第一步:需求分析,第二步:品牌规划,第三步:品类规划

B、第一步:需求分析,第二步:品类规划,第三步:品牌规划

C、第一步:品牌规划,第二步:品类规划,第三步:需求分析

D、第一步:品类规划,第二步:品牌规划,第三步:需求分析

题型:问答题 简答题

加热制度是指原料在加热炉中经历的升温过程。

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