《变压器、高压并联电抗器和母线保护及辅助装置标准化设计规范》规定，220kV电压等级
题型：判断题
问题：
《变压器、高压并联电抗器和母线保护及辅助装置标准化设计规范》规定，220kV电压等级变压器保护优先采用TPY型CT；若采用P级CT，为减轻可能发生的暂态饱和影响，其暂态系数不应小于3。
题型：判断题
阅读理解
American cities are similar to other cities around the world:In every country, cities reflect the values of
the culture.American cities are changing, just as American society is changing.
After World War ?, the population of most large American cities decreased; however, the population
in many Sun Belt cities increased.Los Angeles and Houston are cities where population shifts(转移)to and
from the city reflects the changing values of American society.In the late 1940s and early 1950s,city
residents(居民)became wealthier.They had more children so they needed more space.They moved out of
their apartments in the city to buy their own homes.They bought houses in the suburbs(郊区)．
Now things are changing.The children of the people who left the cities in the 1950s are now adults.
Many, unlike their parents, want to live in the cities.They continue to move to Sun Belt cities and older
ones of the Northeast and Midwest.Many young professionals are moving back into the city.They prefer
the city to the suburbs because their jobs are there; or they just enjoy the excitement and possibilities that
the city offers.
This population shift is bringing problems as well as benefits.Countless poor people must leave their
apartments in the city because the owners want to sell the buildings or mak
e apartments for sale instead of
for rent.In the 1950s, many poor people did not have enough money to move to the suburbs; now many of
these same people do not have enough money to stay in the cities.
Only a few years ago, people thought that the older American cities were dying.Some city residents
now see a bright, new future.Others see only problems and conflicts.One thing is sure:many dying cities
are alive again.
1．What does the author think of cities all over the world?
A．They are alive.
B．They are hopeless.
C．They are similar.
D．They are different.
2．Why did American city residents want to live in the suburbs after World War ??
A．Because older American cities were dying.
B．Because they were richer and needed more space.
C．Because cities contained the worst parts of society.
D．Because they could hardly afford to live in the city.
3．According to the 4th paragraph,a great many poor people in American cities________.
A．are faced with housing problems
B．are forced to move to the suburbs
C．want to sell their buildings
D．need more money for daily expenses
4．We can conclude from the text that________.
A．American cities are changing for the worse
B．people have different views on American cities
C．many people are now moving from American cities
D．the population is decreasing in older American cities